I'm feeling guilty about participating in the general throw-away culture, but the cheap bike¹ I bought earlier this year to replace my stolen Super Galaxy ended up with a repair bill of most of the cost of the original bike.
¹ It wasn't nearly as much as the price listed in the link. IIRC, I paid about £150. Bikes seem to have been subject to 20% or so inflation since I looked at the start of this year.
So, there's a mostly functional frame (the bike shop managed to strip the threads from the bottom bracket), but lacking a bottom bracket and with knackered pedals, chain, cassette and brakes.
Not sure of the exact frame size, but reasonably large.