Loaded up recently when Nashbar had theirs on sale for $4.99, PLUS 20% off. That made it $3.99. I bought a year's worth. Its on sale for $5.99 and no 20% off. I'll wait....
I tend to use red the most, then yellow and blue.
In flipping, once you master marketing/values in your area, and wrenching; the two most important steps to success are:
1. Buying project bikes right
2. Managing your supplies, parts and consumables. If you pay 2X for the basics: tires, tubes, bar tape, cables; then your margin gets really small.
I tend to "back the truck up" when I see awesome deals on supplies, like the $5.99 sale on 50 foot rolls of lined cable housing, and the $5 tires, etc. If you buy stuff just as you need it, you will tend to pay a lot more for supplies.
Nashbar Yellow:
Nashbar purple, white and black. I typically don't get the multi-color stuff, I just don't like the look. But sometimes, its just "right" for a bike.