You may wish to use these in your projects; we have a very small stock of some on hand, but most will need to be ordered.
proto shield $6.99
lets you solder components, then fits right onto the Arduino Uno
AdaFruit trinket $14.49
a smaller version of the Uno
you will need to solder on power supply
16Hz Arduino and Starter Kit, $24.99
the cheapest reliable Arduino clone I’ve found, comes with breadboard, USB cable, LEDs, speaker, photoresistor, jumper cables, etc.
wave shield to play sound files (e.g., mp3) $22
requires a significant amount of soldering to put together
works with an external speaker or headphones
color LED strip (10 for $5.99, 60 for $20.99)
LEDs can change colors programmatically
one pin can control all LEDs individually
strip can be separated into individual LEDS (wires can be soldered on to string them together)
LED matrix (5x7) $14.99
you can chain these together to create a larger matrix
Ray's Hobby provides an easy-to-use software tool that allows you to program custom patterns
tiny fan $7.99
when power is connected, turns on (similar to an LED or vibrating motor disc)
the Maximal Power brand holds a charge nicely and can even run a couple servos. These are much cheaper than disposable batteries within just a few uses and better for the environment too.
useful when you want your Arduino to run for hours or days in one place, as with a photo trap. Also good for robots you want to tether, for example a robot with a power drill.
if you want to run stepper motors for more precision.
individually or as a set with wheels. Also available with amazon prime shipping.
Tower Pro Metal Gear Micro Servo
small and powerful servos, great for arms and other moving parts. Also available from VicTec - good despite the low rating.
useful for quickly connecting sensors directly to your Arduino without soldering