The newer A77 and A99 and translucent mirror bodies use SD cards, all the older bodies that will be in your price range use CF cards. If you want a traditional SLR then you can get a Sony 100 or 200 at around a $100, moving up an A700 for around 200 to 300. I have a A900 and 700 along with a A7II, I still prefer a traditional SLR, as good as the EVF are they are not as good a seeing through a lens, mirror and prism. For under a $100 you can find a Konica Minolta 7 or 5, these are getting quite old so do not know how long they will hold up. The Konica Minolta and early Sony use CCD sensors, the colors are quite nice.
Other option is to get an adapter and use your A mount lens on a Sony E body. I have a couple of adapters for a entry level Sony A3000, Pentax M 42, Miranda, and Minolta MD, not AF and the EVF is really crap, but workable. Forgot to add that the Sony brand adapter that maintains all functions is pricey, you want a bear bones version.
I think the best bet is the A700, good enough pixel count for decent enlargement, shoots 5FPS, viewfinder is quite nice, easy to use.