As mentioned above, a top quality scope is going to run $250 at least. There's really no way to use a cheap scope if you're shooting at 100 yards. If you've got a really good strong set of binoculars, that might work. A rifle scope may work too. You'll just need to hand-hold it, as I'm presuming you're shooting with irons. Maybe someone at the club has an old one you could borrow too.
However I have this spotting scope and it works pretty darn well. I've tried a few others at the $150 range and didn't have any luck. This Celestron is sharp and bright, and does well enough for a few hundred yards. If you're just shooting at 100 yards, this should be great.
As for a stand though, that's where your gonna be suprised on price. Most are going to run a couple hundred. I'm out of town and don't have the name, but was just shooting a match and there is a guy in Wisconsin that makes a pretty good stand I saw, supposedly under $200. Will post it if I can find it. In the meantime, I've just been using a redneck scope stand and it works fine. 5' of 1/2 conduit, built up a base and platform with 2x4s, drilled a hole in it to sink the conduit, had an old camera clamp and bingo! spotting scope stand! You can try using a tripod as well. Only issue is the base width may interfere with the shooters space next to you, and it may be difficult to get it low enough when you're in prone.
Hope this is helpful.