Not all stores carry all colors, but in general, these stores carry colored duct tape:
ACE Hardware Stores carry Duck® brand in colors which is privately labeled with their ACE name. You will still be getting quality Duck® brand tape. (participating stores - call your local store for specific color information)
True Value Hardware (participating stores - call your local store for specific color information)
Meijer (MI, OH)
Albertsons (CA, ID, OK)
Mills Fleet Farm (IA, MN, ND, WI)
Michael's stores nationwide
(pictured on the left is a Michael's display showing a purse you can make with Duck brand tape - and a rack full of really reasonably priced colored Duck brand tapes)
Lowes nationwide carries some Duck® brand colors like black, white and the five-pack tube (yellow, green, red, blue and silver).
You can also find information on Duck® brand's site where to buy page.
Or, BUY ONLINE!
15 colors of America's #1 brand of duct tape delivered to your door (Case lots only) Sale priced between $24 and $50
available at http://ducktapeclubstore.com/index.htm