Where to buy decent cheap luggage CM?

I see either pricey designer luggage at the malls, or stuff that looks like it will fall apart at the markets.

Anyone have tips where I could find a solid stow-away size luggage for a decent price?

It's a one-time use thing, I usually travel carry-on only But want to haul a load of clothes home.

Thoughts that came to mind: abandoned luggage at hotels or airport, a store I'm not thinking of, online classifieds?

Thanks!