Nothing wrong with picking up more ammo, safe bet.
I have a spotting scope that I picked up a couple years ago for my .308, and I wanna say it was only like 50-60 bucks. It's a Walmart special, but all I'm doing is looking at the 100yd line after shots have been placed. It's a Simmons, and I believe the make/model is Blazer, it's 20-60x60, it's rubberized and waterproof. It also came with a tripod w/mounts and cases for both the scope and the tripod individually. For being a low price scope it has pretty good clarity too, just chipping in what I have experience with, good luck.