try to get a budget one like steve said...
or a cheaper sunoptic one + a mount..man magnifiers are expensive..
The cheap sub 100 dollar ones are crap that I can confirm...the one I had misalignment, and the mount won't even stay secure on my rail...swivel was super loose..
I have never really used any red dot that is not RS rated, so I can't say how those "chinese" clones would do..most of them should do fine since a GBBr is similar to a .22...but a RS rated clone is not that much more expensive so I just bought them instead..
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