I have a Minolta 50mm AF lens, a-mount, that I'd like to use on a Sony a6000 e-mount. Is there a reasonably priced adapter out there? Also is the Minolta MD/MC lens an a-mount?
It depends what you mean by reasonably-priced.
The Sony adapters you can use are the LA-EA2 or the LA-EA4. The difference between the two is that the LA-EA2 only has APS-C coverage, while the LA-EA4 has full-frame coverage. For your use case - on an APS-C camera - either will work. (Both of these adapters have an in-built focus motor, required to power the autofocus in screw-drive A-mount lenses.)
The Minolta MD/MC mount is not the same as A-mount. But you can also get adapters to use these manual focus lenses on E-mount cameras. In this case, there is no official Sony adapter; you will be looking at third-party brands such as Novoflex.
You can find best and low rate Sony adapter for Minolta 50mm AF lens at https://www.amazon.com/Minolta-50mm-f1-7-AF-Lens/dp/B000EHMGBA. For more information you can check Sony A6000 manual.