I don’t research or keep a record of local sources for sheets and bedding (hopefully some of the members that are in the Greenville, SC area may see your post and have some local suggestions) but post #7 here and the other posts and topics it links to has much more information and feedback about sheets and should be helpful (I think I may have linked this in a previous reply so you may already have read it).
As you will read … thread count can be very deceiving.