The Numphy air series are also a popular low profile option I have not used one yet so I cant speak to it personally. They also support QMK/VIA for customization.
Ajazz offers a some 75%'s but they are seen as a budget brand so long term software support and customization options may be lower. I dont see anything related to Hotswap or QMK/VIA so you may not get them as features. Also its subjective but Outemu switches are also seen as budget options. Personally I do not care for the Outemu box switches, but I find the traditional Cherry Clones to be ok depending on the color type. Outemu Purples and Silent White are my go to budget switches when building boards for friends who dont have a big budget but also dont really know what they want yet.
Another OEM low budget option, personally I would not buy any of these. I Have two of their other keyboards one specifically because of the MCU chip on it, the other because I needed a 60% for one of my kids gaming computers. They are plastic crap, but they are cheap.