Hi xcoupeb,
I hate to say this but I think you are going to struggle to find anything in that price range. The qsi w/OAGs start from 4500 and the sbig w/OAG is 5000. I can't comment on the older sbig self guiding cameras as I've never had any experience, but I'm sure they aren't any cheaper.
I'm currently using a QHY9 w/filter wheel with good results. Perhaps you should up your budget and save for a while or look at getting a guide scope.
What's turning you off a monochrome sensor?
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