Adafruit

US$13.79

This 8"/200mm long swivel dipole antenna has 5dBi of gain and 50Ω impedance so it will work fantastically with just about any 2.4-2.5GHz wireless receiver/transmitter such as: 2.4GHz Wi-Fi (802.11b/g/n), 2.4GHz XBee, Bluetooth, Other 2.4GHz transceivers.

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US$3.42
These are standard '130 size' DC hobby motors. They come with a wider operating range than most toy motors: from 4.5 to 9VDC instead of 1.5-4.5V. This range makes them perfect for controlling with an Adafruit Motor Shield, or with an Arduino where you are more likely to have 5 or 9V available than a high current 3V setting.
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US$17.42
This prototyping shield is the best out there (well, we think so, at least), and now is even better with Version R3 - updated for the most compatibility with just about all the Arduinos! It works with UNO, Mega, Leonardo, NG, Diecimila, Duemilanove, and compatible Arduinos.
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US$12.17
This little lipo charger is so small and easy to use you can keep it on your desk or mount it easily into any project! Simply plug it via any MiniUSB cable into a USB port and a 3.7V/4.2V lithium polymer or lithium ion rechargeable battery into the JST plug on the other end. 
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US$3.07
This breakout board has a USB Micro-B connector, with all 5 pins broken out. Great for pairing with a microcontroller with USB support, or adding USB 5V power to a project.
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US$5.68
This navigation switch is an intuitive way to add 5 button's worth of interfacing with a single component. Inside is 5 switches: left, right, up, down and 'select' (pressing down), all with a common ground pin.
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US$3.42
Repair or design your very own audio cables with these nice and durable phono-jack connectors. This is a great plug to make your own cable with. it's made out of durable metal with a flexible, sturdy spring for strain-relief. Just solder the connector to some wires and you have a DIY audio cable that can rival the best!
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US$34.65
This Raspberry Pi add-on is perfect for any motion project as it can drive up to 4 DC or 2 Stepper motors with full PWM speed control. This chip handles all the motor and speed controls over I2C. Only two pins (SDA & SCL) are required to drive the multiple motors, and since it's I2C you can also connect any other I2C devices or HATs to the same pins.
Delivery within 2-3 weeks
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US$2.63
Piezo Speakers are used for making beeps, tones and alerts. This one is petite but loud! Drive it with 3-30V peak-to-peak square wave.
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US$8.67
This breakout PCB set will make your life much much easier and get you prototyping faster than ever. One side has a 12-TSSOP pin out with traces going to two rows of 0.1" spaced holes, the other has 12-SOIC. Solder your chip to either side and you're ready to rock on any solderless breadboard.
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US$12.47
This connector is sturdy and easy to panel mount, and has pre-soldered wires connected to the 6 contacts (of which 4 are used).
Delivery within 2-3 weeks
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US$48.92
40 eye-blistering RGB LEDs adorn the NeoPixel shield for a blast of configurable color. Arranged in a 5x8 matrix, each pixel is individually addressable. Only one pin (Digital #6) is required to control all the LEDs. You can cut a trace and use nearly any other pin if you need some customization. 
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US$2.88
This tiny 1" diameter speaker cone is the perfect addition to any small audio project where you need an 8 Ω impedance and will be using 0.5W or less of power. We particularly like this cone as it's very simple and its metal body is extremely lightweight.
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US$5.69
These work best in a PCB but can be used on a solderless breadboard. The pins are normally open (disconnected) and when the button is pressed they are momentarily closed. These are extra tall which are useful when putting your project in an enclosure and you want the buttons to stick out.
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US$8.67
Z-axis tape is made by 3M, and is used to bond two conductive surfaces together and allow a small (we'd say keep it under 100mA) current to flow through the tape. But here's the cool part: its only conductive across the thickness of the tape itself, not along the length or width.
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