I reuse my nice Geo Pots, but I buy the cheapest 1 or 3 gal I can find. They're generally about $1-$2 a piece. 90% of the time, I'll just cut them off when I transplant. I guess I pay a bit extra for the convenience.Eww.
Scrub your sacs bro! Lmao. I re use mine too. I'm not sure a lot of people are against it but some are. I have a thread started on it.
My big pots get turned inside-out and hit with a pressure washer.