I use the Nikon XL 15X45 spotting scope for hunting. Works very well, small, light, and very good optics. a bit more then your budget but they can be found on sale. I got a factory refurb and am very happy with it. Used and abused for 6 to 7 years and has never missed a beat.
If you want a very high mag spotting scope and don't care about size or weight, the Celestrons are dirt cheap. You can find them at London Drugs and are very good for the dollar.
If you just want to do general glassing, consider binos. Way easier to look through for long periods of time. I am using the new Nikon EX 12X50 porro prism binos for glassing and they are very good. Wide field of view, very clear image, great low light performance. The image quality to 1km is amazing. You will still need a spotting scope to really get up close but these binos will help you find them quicker. Won't bother telling you the price as you will not believe me.
Jerry