Basically, any brand of antistatic, paperbacked sandpaper will do. Sia, Hermes, 3M and Mirka make good sandpaper and all can be bought in 115mm x 50m rolls. There are other brands about but these have never failed me.
I second not using net sanding paper. I use mirka a lot, and its brilliant except when I stretch a piece along my 12" sanding block held at each end with toggle clamps. It goes baggy very quickly.