I have registered as a business with selitas and the prices are good if you want 1000, lol at a time with out tax they come in about CH60 (€40 ish)each if you want 500 to 999 if you just want 1 then it is ch90.
Have a look in my sig for the post about the leather on ocean racer, the contact were i got mine is in there and i have had no problems with it at all. It is push button and well made.
Of cause you can, all rolex movements are tested by COSC uncased with out the auto wind ect, I do it all the time there is no point recasing if the movement has a problem that requires disassembly
The info on here is far easyer to find than finding things with a metal detector, There are some great breitliings out there, and you may have to wait a while for a B01 to be as good as the skylands or BCEs. Welcome to the forum though, spend your time reading before you spend your cash.