Sandpaper question

[city_ofthe_south]

Was wondering how and/or where you guys are getting sand paper. There's nothing where I live locally, so I'm looking on line. I'm looking for adhesive stuff for Dura-Blocks. Let me know if you find the rolls or sheets the most handy. I've seen 3M of course and Mirka, do any of you have a brand pref? I'll only be looking to do a couple cars so I'm not sure if I need 40 yards of paper, then again I'm not really sure. Plus the fact that the rolls seem like they'd be pretty useful and probably cost effective. Anyway, thanks for the help. Any information is helpful.