4.5 is crap, get 6.2 (have one very good one if interested, brand new cover). Cheap??? lol nothing for amiga is cheap if contrasted to pc (nothing has been made for amiga in 10 yrs so prices are higher as anythign collectable, remember what pc stuff cost 10 yrs ago?). 020 board - sold one last year for 40$. I got super denise chip - let me knwo if interested. flicker fixer or rtg for $20??? no way, not in my best xxx dream ;-) :-D
I got graphics card but may be not in your price ranges you mentioned. Amiga isn't commodore 64 (some users come from c64 environment and expect low budget stuff with amiga).