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Do you want a scope or something tactical like a red-dot or holograph?
If you don't need the magnification of a scope, Ive seen lots of cheap red-dots from the site at the top of the page for between $50-100. They might be garbage, but for appearances a lot of them seem to replicate the looks and shape of ACOGs, Aimpoints, etc... I even saw a few red-dots at canadian tire to for $39!
You could look at a UTG Bugbuster. Fixed or variable, I have one of each. Reticle is lighted and a little thick but for most shooting it's ok. I got a 6X from D+L airgun. Needs an offset mount to get it back for eye relief.