Not sure if you were interested in 16s, but I've got four 225/75/16 Roadstone A/Ts mounted to the stock 16x6 SV420 silver rims that are sitting in the shed not being used.
Tyres are extremely good condition, would need to double check but Im sure they are 80+% tread (probably more like 90%).
That said, they are a shade bigger then you are wanting (29.3" versus 28.8") and I've only got four of em sorry.
$400