We just broke one of our our compressors. I went to a local medical equipment store to check out what was new in compressors, and I guess Pari now has a portable travel compressor/neb, called the Pari Trek! You might want to check it out at http://pari.com/pdd/pdd-compressors.htm
Or are you just interested in nebs? Sometimes when people say "neb" they really mean compressor, and sometimes they do mean neb.