I bought a new ST 175/80 D13 mounted on a new Rim and delivered for about $90 today. Same size as a radial was $10 + tax more.
The seller lives near St. Thomas and lists frequently on Kijiji in both London and Toronto. Look for Clentec on either. Chatting with him (Adam), he picks them up in Indiana, so he passes through Michigan and the real SW part of Ontario.
It looks like the 15" are on Aluminum rims.
The tire warranty is here: