Marketplace (which I loathe), there are several in TX but most are pretty high IMO. TexasTruckTire (also on eBay) has a few sets - might be with asking if they would sell a set of wheels only...
Should be 47.5 but I'll confirm later today. They are stamped 8.5" wide.
I think the back of the rim says 47 but it's been 2 yrs since I got mine.