Basic 28" or 26"

Hello,
I’m looking for a 28" or 26" uni that can take some abuse. I learned (and taught others) on an old Schwinn 26" that is ready to retire. I’ve been looking at Sun and Torker for a basic model, but I’d really like to find a used ride and save some cash (I haven’t had any luck on CL and Ebay, so far).
Thanks!