WGS on Sand Island
WGS is definitely the best place to buy powders that no one else has but comes at a premium price. WGS and Jhara averages about $50 per bottle. WGS is the only place I know that has Unique and I4451.
AFAIK, the cheapest places are:
1. Roy's Fishing. Can get some powders for $24 per bottle (including H4350) and bricks of primers for $28. They specialize in Hodgdon powders, mostly H brands. You have to know what you're looking for so bring a list with you so they can look it up in the computer. They then go in the storage area to get it. Their inventory is stocked when Roy apparently makes a run to the mainland so when they're out, they're out.
2. HGS. About $33 per bottle average. Great inventory. I've noticed that YG has become competitive but their inventory is much smaller.
3. SEC. About $37 per bottle average. Better inventory. Sometimes have 10% off sales. Big selection of 8 lb jugs (but no Varget). Primer bricks are about $34.
4. I can't remember how much Prime Sports is, but he has a very limited supply on the shelf.