With the DNDBeyond site having 20% off it's books I think it might be a nice time to buy some digital copies. I was looking at the players bundle but wanted to know what other books had playable character options https://routerlogin.uno/ https://192168ll.link/, I couldn't find an extensive list and wanted to know if anyone had that handy or if they knew where to find it.

If it's in the Sourcebooks section instead of the Adventures section, it has character options. The only exception to that is Wild Beyond the Witchlight, which is in the Adventures section but has some races, and the Monster Manual, which is a sourcebook but doesn't have much use for players unless you're a druid maybe.

Some of the books have overlap, so you don't need to automatically buy everything, but if you only want to buy the stuff for the builder and don't care about reading the content, then you still need to know what book it was first in, to buy it from that book (except for the artificer subclass, which you get from Tasha's now).

I wouldn't buy anything underlined in Orange until the new Mordenkainen's book comes out (a lot will be superceeded I think) as afar as player options are concerned. There is still good non player stuff in those books.