In my organization, our volunteers are recording at home and transfer the completed work either by FTP or by CD. At present they record directly in MP3.
Obviously we would prefer that they record in WAV format but the files would be much bigger, they would need DVD-R rather than CD-R and FTP transfer would become problematic.
An option would be to use lossless audio compression before the transfer. That will depend on the initial sampling rate and on the achievable compression ratio.