Cinnamons tend to hold their dark colors very well. Banana, especially when mixed with enchi, lesser/butter, or black pastel looks nice..Be aware that banana changes color as it ages and most of them get black spotting.. I think that is less with liesser / enchi.
An albino would probably also work for what you want, but I'm not sure on their price range.
You might be able to get a ghost (hypo) for $200. If so, they tend to stay brighter and look better with age IMO.
I would suggest you browse morph market and world of ball pythons. On MM you find listings and you can see what the average price is. On WOBP you can view morphs to see what their appearance is.
I would join a local (for your state) FB group and see if you can find some local breeders.. Be aware that with buying online or from a local person, you will want to search them on google and on the fauna classifieds BOI to see if there is any feedback on them.
I set the filter on MorphMarket to a maximum of $200. You've got 2,840 ball pythons to choose from. Just keep turning the pages until, as someone said earlier, you find the one that speaks to you.