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Usually if it's for sale on Bandcamp it is available in lossless quality (but you can download other formats if you wish). Discogs is a bit strange when it comes to digital formats; usually they don't list all that are available, so you shouldn't treat that as a theoretical maximum quality level. It is possible that a label/artist might sell transcodes (MP3s converted to lossless audio, which retain the original audio quality level), but rare in my experience. You can get a sense of this by using a spectral analysis tool like Spek, but it takes some skill to operate. All that being said, for home listening purposes you're probably fine with 320k MP3 quality.