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Alexander,
Are you looking for a reflector or refractor OTA?
If refractor and you sound like you want to DIY, you could check Surplus Shed - they have a Jaegers cemented objective 110mm diameter x 495mm focal length for US$125. Of course there is a bit more to it than this, have to make a housing for the lenses then a tube and focusing etc. It is something I am considering but at this stage, I don't know how much effort is involved getting all the right bits.
They have others in different sizes and FL's that are already mounted in a cell which might make things easier.
-John
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