The best advice you will get is
DO NOT buy a cheap spotting scope. If you need to
USE a spotting scope, a cheap one will be of no help.
I bought my Zeiss spotter in 2001. I don't ever need another and it is just as good today as it was the day I bought it.
It has allowed me to see the little white dots in the Yukon at 4 miles were rams and worth a closer look. It allowed me to spend weeks on end glassing huge country in Colorado finding the Bighorn ram I would chase every day. It has been from Alaska to Arizona and has helped me on every trip I took it on.
Save up, get a Swarovski, Leica, or Zeiss and be satisfied. You will spend much more upgrading until you finally end up with one of those three...