depends on what gels you like and what kind of packaging, single serving or multi serving?

Performance bike often has the powerbar gels on sale, buy one box, get another box free

Hammer Nutrition has a 26 serving bottle at a really good price, if you buy 3 or more is even cheaper

those are the only ones that i know of, cause they are the ones i use, i am sure there are other good deals out there.