With my 920, I use an old Primestar remote, that I got at a local thrift store for a buck! The "Menu" button in the middle of the channel/volume buttons brings up the satellite selection screen. The remote for my DSR 4200V works it too. Most all of the GI/Motorola boxes will work with each other's remotes, just some function buttons are different.
I called rps sat about a month ago asking for a 4dtv replacement remote, since mine is slowly dieing, Roger told me he has the Voom remotes for 4d replacements. So I guess you can look around for one of those to.