I also have only been able to find the white tic tacs at Costco. They work out to about 75cents each for the candy. I have been able to sell them for $4 or 2/$7. When my product has to be more expensive, I try to add some bling to make it seem worth more... even glitter glue helps with that. I also package them indivdidually in clear bags so they look good.
Last year, I separated the green and red M&Ms and sold them in the 1x8 bags as Grinch Pills and Reindeer noses. The grinch pills always sell out first!