Or as I believe syncromesh(?) suggested on another thread, you could put it on a thumb drive and mail it to them or hand it to them. Depending on your location and upload speeds, this may be a much faster route (a win for snail mail!)
EDIT: It just occurred to me that there still yet may be a use for those blank DVDs you probably have laying around somewhere! Even cheaper!
MAME Cab PC: i7 4770@3.4Ghz (passmark 9945), 12GB RAM, Win 8.1/64, GeForce GTX645 (passmark 1898); Shiny new laptop: i7 4800MQ@2.7Ghz (passmark 8586), 16GB RAM, Win 8.1/64, GeForce GTX870M (passmark 3598); Old laptop: i5@2.3Ghz, 8GB RAM, Win 7/64, Intel 3000 graphics