Dirtbikes/quadbike

there are some stores that sell chinese made quads / motorbikes but the quality ain't that great.

otherwise your best bet is to check on OpenSooqLibya online and check the motorbikes section.  some bikes are relatively new but mostly are second hand ( or third cause they come from abroad as second hand ).

make sure to bargain the price since often they're inflated prices on the net; and test drive the bike when you meet them.  bring along a local friend if you can or make him do the bargaining and stay out of the picture.

good luck.