Looks like S. compressus to me. Maybe S. altuvei but the spots aren't easy to make out. Compressus will have tiger stripes at this size. Altuvei has spots too. It looks to be one of the two in my opinion. It's pretty easy to rule out/ confirm sanchezi. S. sanchezi has irregular scutes. Get a close up of the scutes and that can tell you what it is.
Personally IMO...90% S. compressus. I don't see any spots though.
I would happily pay 75-125$ for this fish at 6-7" if I was in the market.