What do you consider affordable? Also what type of tank and its tankmates? Some are much more coral appropriate than others, and others can be down right nasty to some types of fish. Also their tank size requirements vary greatly. Dwarf angels other than the extraordinary are affordable.
Some like a lemon peel can be a bit aggressive and likely to nip corals. My coral beauty was around $50 i think, i honestly don’t remember the exact price, not uncommon but a very pretty fish that fingers crossed hasnt bothered my corals [emoji23]
Others would be lamarks angel or a black velvet angel. Lamarks would be the first choice between the two for temperament, coral behavior, size and number of keepers who successfully keep. But both are lower priced though.
My next build was going with a pair of multibar angels expecting to be about 2-300 just for them.