For that kind of money you are not going to find decent glass in a "new" scope (you are looking at $1600-$4000 for a "good" new spotting scope). You should probably watch ebay and be patient (also watch Craigslist and do a national search - some people will ship if you contact them) depending on how urgent your need is. I watched a used Kowa 60mm go for $330 and kicked myself for not bidding. I then watched for a few months and scored a "old model" Celestron Ultima100ED scope (Now Regal series of scope) in like new condition for $280. It has a 22-66x zoom eyepiece and the 100mm objective gives a good field of view, but it is pretty big and bulky (a little bigger than the Konus 100mm). Way better glass than the <$350 Barska/Konus/Bushnell scopes I have looked through. I can just see .308 groups on paper at 300m with it. Calling shots on steel out to 900 yards is not a problem. The only problem I have had with my Ultima100ED scope is that it is so big/heavy you need a decent tripod for it. My $60 tripod would not hold it steady (especially with wind blowing) and I had to spend another $120 for one on sale from Calumet Photography to get one that works, but I would still like better. Been looking for a "good" one on Craigslist that is not $500-$700 so I can also put my Pig saddle on it and learn to shoot from a tripod. (needs to be able to hold 17-20 lbs which is for a video or big view camera)
Saw a guy at the range last month that had a Celestron C90 MAK scope (was one of my former options) that was not too bad either. I only got to look through it for a minute or two. They are compact, even if a big diameter. They are on ebay for $160 and less and you can still get a decent tripod for your budget. Buy used so if you don't like it you can probably resell for what you paid.
Maybe look for an old military one? I used a M49 spotting scope for matches when I was shooting M14 competitions in the service. They are only 20x but the glass was surprisingly good and worked fine for our 600m matches. These go for about $300-$350 on ebay maybe you can get one for less if you are patient.
You may want to check the "birding" websites to see if you can get something used which should give you more bang for your buck.