Cheap, light AND durable...sounds like you're looking for perfection...unfortunately, finding all 3 is quite difficult.
FKS bindings are arguably the most durable bindings on the market today...but not the lightest, and certainly not the cheapest.
STH bindings (non-driver toe) are very light, but also not the cheapest, and loose some durability. While the driver toe version increases the durability, it also increases the weight a bit.
PX/Axial/Freeski series...don't get me started...heavy, not super durable (unless you rock the 18 DIN, which you most likely don't need...and even then they're "meh" at best), plus side, they're pretty cheap
Marker Royal Series (Squire, Griffon, Jester) mid-level price, squire has very limited durability, griffon is slightly better, jesters are pretty good, but the price goes up, as does the weight.
...are you seeing the pattern here...high durability=high cost and usually some weight involved.
You're best bet is probably the Tyrolia/Head/4FRNT Peak/Mojo/Deadbolt series, lightweight, not that expensive, and actually pretty durable.
I'd also recommend looking here:
https://www.newschoolers.com/ns/forums/readthread/thread_id/481906/