Way too vague. What kind of scope are you looking for? Springer rated, PCP. ? Variable power, fixed? Etc ….
Also, I have learned VERY, VERY quickly about using any financial descriptive words on the Optics section ! One person's affordable is another person's used car purchase. I used to buy the best glass. Because the difference between it and mid grade glass was HUGE. The past ten years has closed the gap tremendously. See Discovery and Athlon for two examples. Way more than with the actual airguns. optic "enthusiasts", often mislabeled "snobs" , is RAMPANT !!!
I carried my new Athlon scope over to my buddies house this week. We compared it with probably 10 different scopes on some of his guns. There were four of us there. NONE of us thought the lowly Athlon scope was bettered by any scope we compared it to. And a couple of his were $800 to $1000 scopes. Our eyes just were not capable of seeing the differences worth spending an extra cent. I left with several people looking up Athlon and Discovery, and murmuring about selling their expensive scopes for Xmas funds.
Smart men as far as I am concerned, JMO.
Anyway, if for a PCP, I would look at a Simmons Predator Quest scope. Can be had for $150, and compares with well with Bob's huge array of different scopes. I have been using one for years, and it is so repeatable, I have a scope knob on it, which I use to track vertically from 15 to 140 yds, PERFECTLY repeatable. So it boils down to what YOU need to spend to feel comfortable about your purchase. You can spend more on ANY scope, but you won't shoot any better. You will just be spending more.