There are many, many sponsors here on R2R you should take a look at. "Cheaper" is a very relative term but I would take a look at the sponsors section and see what's being offered.
Unfortunately the more “pop” you have the bigger the price tag. Local Frag swaps are going to be your best friend. Lots of CRAZY deal their. Otherwise, I like WWC, Battlecorals for SPS. I definitely agree with @dbl to check the sponsers section. Lots of great guys with good service.
-Zack