I personally avoid those cheap prices, i prefer to spend a little bit extra and buy something that is more durable. Every cheap inner tube i bought, after a while the valve easily camd off the tube and can't be repaired, problem absent from other more expensivr innertube, the expensive one you can beat as you want and they still keep.
Obliviously for expensive I'm talking for a normal range inner tube (5€ max) and the cheap around half of thr cost (in italy we found those cheaps on any chinise store).