When the Sportsmans Warehouse chain went into bankruptcy, the Canadian firm invested approximately $80 million dollars into the company. When the bankruptcy was over, they ended up with all the Washington stores and all but one of the Oregon stores. Sportsmans Warehouse kept the Medford store and the Reno, NV store, and most of the rest of the chain.
Wholesale Sportsman carries the same lines that Sportsmans Warehouse carries, and about the only thing that changed was the name over the door. There are a few things where the price might be a dollar different, but they're pretty close in pricing.
The last time I was in Wholesale Sportsman they had an ample supply of both primers and powders. I've never looked at their website, so I don't know what they have listed there.
I buy my powders by the 8 pound keg, and normally by the case. If I'm in the area of either Sportsmans Warehouse or Wholesale Sportsman, I'll check to see if they have any kegs I might need, but most of my powder purchases are through Connie's Components:
http://conniescomponents.com/powder.html Their prices include HazMat and there is a discount for each additional keg you purchase.
For primers, I have a friend who orders in lots of 200,000 and I get my primers from him at cost. I either cast or swage most of my bullets, with the exception of rifle bullets, which I buy. For those, I watch for sales and stock up when the price is right.
Hope this helps.
Fred