Bass Pro or Cabela's, you will find them in the fly tying section as they are mostly used for steelhead flys. Wapsi Super jig heads are my favorite as they have a super strong hook that will land an 18-19" SMB. I also use Danielson micro jigs and the standard Wapsi micro jigs but they are not as near as strong, but the hook sizes are a slightly smaller than the Wapsi Super jig head version. 1/80th oz and 1/64th oz are the two sizes I prefer. This is the same set up I use for catching RES and BG, they are great for catching any type of sunfish.

Micro jig heads are not easy to find if you don't know where to look for them. Here are a couple of places that I found on line that stock them, no endorsement as I don't have any experience ordering from either one of them. When I was in Bass Pro in Council Bluffs a month ago and they were packaged under the Cabela's Brand, not Wapsi.

https://www.fishusa.com/product/Wapsi-Super-Jig-Heads

http://www.worleybuggerflyco.com/WAPSI/BubbaJigHooks/BubbaSuperJigHeads.htm