Check with @thecharizardauthorty. He is quite busy, but has a lot of great sheets and quite the variety. I bought a bunch off him last year for what I believed to be fair prices. (Not much of an established public market on these)
That’s the first place I checked actually. He just has the one wrapper sheet up on his site, forgot to check his eBay, but I know he usually is the sheet guy.
He has way more than what is listed. He had a long list with pricing when I sent a request and then he even made an individual video on some of the stuff I was interested in as well as some of the more obscure stuff that I was looking for also.