The guy that made the seeds is a member here (FatMarty) but I believe he got banned a while back. He obtained a pack of grape stomper seeds years ago from the original breeder, and has used those seeds to make F2's of the GS, and has used that same male to cross with other females (Exodus Cheese and others). He does not sell commercially, but is very good at what he does. I have grown out both the Grape Stomper, and the Grape Stomper x Exodus cheese (Grape Fat Cheese) from him ..... both of which reeked like grape soda, and were frosty as fuck ..... which is what I was after with my Grape Stomper pack that I purchased from GGG, but sadly both females from that pack tasted/smelled nothing like grape, and were very much inferior to the seeds from Fat Marty.
Funny how a guy making seeds in his basement and giving them away for free can out-do a breeder charging $100+ a pack.