Yes, more exactly Bandcamp encourages artists to upload lossless audio files (WAV, AIFF or FLAC), which (being lossless) are equivalent, formats available for download are all generated from lossless data.
Some artists even upload 24 bits / 192 khz lossless files, which can be downloaded in any supported lossless file formats. When you compare with crappy MP3s most websites (including Amazon) provide…