Where to buy LEDs
Links to online stores selling LEDs:
MCMelectronics.com: 3mm, 5mm, 8mm, 10mm LEDs.
Radioshack.com: LEDs & LED holders and assemblies.
Parts-Express.com: Standard, Ultra-Bright, Multi-Color and Flashing LEDs.
Ebay.com: Search for LEDs here, or use the search box below:
There are countless listings on ebay for every shape, type and color of LED, even pre-wired 3mm and 5mm LEDS for 12V car power supply. You can also find a good number of kits there, such as this assortment of 75 5mm, red, green, yellow LEDs, this assortment of 300 3mm T1 red green & yellow LEDs, this 80 pieces kit containing 15 3mm and 5mm green, 20 3mm and 5mm red and 10 5mm yellow LEDs. If the offers above are no longer live I'm sure you'll find a better deal in seconds. There were over 700,000 listings at the time of this writing!
Maplin.co.uk (UK): has a large selection of LEDs here - standard 3mm, 5mm, 8mm 10mm LEDs in many colors, flashing LEDs, infrared and multicolored LEDs.
Rapidonline.com (UK): miniature, 3mm, 5mm, 8mm, 10mm, surface mount, rectangular, power and infrared LEDs.
Other stores: Amazon, Farnell (UK), Digi-Key, Frys, Mouser...
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See also:
LED series current limiting resistor calculator
Resistor color code calculator
Surface mount resistor code calculator