When on a budget... it's your choice what to get.
You could look for a used Kowa or an older model used Champions Choice.
I looked for long eye relief, clear optics, and angled tube/eye piece.
I can wear my eyeglasses plus shooting glasses over them & use this scope.
It's not waterproof, which most shooters would prefer. I slip a plastic bag on it.
Many shooters will prefer 25-30X max for the eye piece (mirage, etc.).
Here's where I got mine new, best price on this model.
www.digitalfotoclub.com/sc/product-features.asp?id=794737016#fsSpecs:
45° inclined roof prism especially designed for shooters.
Kit includes low level tripod, case and 836PA photo adapter.
Smooth rubber sheathing.
10 element magenta coated optics.
Air spaced triple lens system.
Eye relief: 33mm/25mm.
Weighs 30oz.; Length 14".
Equipped with sun shade and threaded ocular.
Photo adapter use requires separately sold T-Mount ring matched to camera body, to attach.).