There aren't any. Period.
Decent spotting scopes start around 550-600 good ones about 1k and up.
Reason being is clarity at high magnification levels. Decent glass isn't cheap and good glass is damn expensive. You can get ok scopes cheap enough that work decent enough because the lenses are small. When you start talking large objective lens like in spotting scopes the complexity and cost of producing usable glass is very high.
Save up and get a good one your just wasting money if you get a low end spotter. Most redfield 3-9 scopes you find at walmart are clearer and better quality than low end 40x elcheapo spotters
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent