Off the peg 26" wheels are getting rarer, but you can still buy budget wheels. For my commuter, I have some
Decathlon wheels that are disc/rim brake compatible. These are now spares, as I sourced some lovely 'period' Shimano XT parallax hubs (via
ebay), then built them into a pair of Ryde Zac200 rims - Ryde still do loads of rims and aren't going anywhere. I managed to wear out the rear rim in 12 months of commuting, so £35 for a new rim, re-laced it, jobs a good 'en. So I have a really good set of quality wheels for my old bike now, that are very serviceable. XT hubs are excellent for the poor weather you get commuting.