I'm struggling to understand the rationale of buying a NEW wheel of any price if all you want to do is bolt it on to a trainer! In fact, I don't even see the point of bolting a decent BIKE on to a trainer come to think of it. After all, the bike doesn't actually GO anywhere when used on a trainer, so it doesn't matter a toss if the frame is made of gas pipe or the wheels did come off a cheap
Halfords Apollo bike. Think of a trainer/bike combo as a piece of gym equipment, because that is all it is.