For 100 to 200 yard shooting any mid-level quality spotting scope will do. I have a couple of old Bushnells that are just the ticket and are actually quite good for longer distance shooting too. You should be able to find a good 20X on Ebay.
If you plan on shooting past 300 yards out to a thousand or so, you'll need a scope with optics that actually see the refraction of light through the air. This will be an invaluable help in adjusting your hold on target or adjusting your scope's windage knob for deflection (windage)
Early in my military career, we used the M49 (Bushnell), but by the time I retired, we were using high-end Leopold spotting scopes and the difference in resolution was amazing. That said, don't be fooled by high power magnification adds, it's resolution that counts in a spotting scope, no matter what the range. It's kind of like comparing a low digit picture with a high digit photo. Coated optics help in this regard as well as top quality glass. The higher the magnification of the scope, the more critical this becomes.
Just make sure that it comes with, or that you have a good stable mount for it. As an old Army rifle team shooter, I prefer the old Freeland stands with extension rods. Again, these should be available used on Ebay. A cheap and wobbly mount is next to useless when trying to discern detail at distance.
One final tip. If you wear glasses, then check what the eye relief of the scope is. A longer eye relief is the best if you wear glasses. Some scopes have fold down rubber eye pieces to accomplish this.
If, as you say in your original post, you just need the scope for 200-yard shooting, you needn't spend an arm or a leg for it.