Yeah, you can rent them from BB.
I would not recommend this. The BB servers are largely unstable, I've read more than a handful of complaints on the SL forums about how poor quality the servers are. You get a lot of rope breaking, combat desync/lag, overall delay in general. When I play with my cousin we have trouble finding a BB server that doesn't constantly break your ropes/lag like crazy when you play.
Also there is another dino survival game on steam called beasts of prey.
It's more modern and has guns n stuff
It looks like another RUST-style cash grab to me. RUST (imo) is terrible and beasts of prey looks just as bad.