So, I am actually thinking about getting a Floyd Rose discovery. It's one with a speedloader, but it's a fixed bridge. Now, if I took it to a luthier or something like that, could they install a tremolo bridge, and how much would it cost?
You haven't made it anywhere until they make an action figure of you.
that depends on what you pay for the fixed bridge model. It might be cheaper to buy one of these http://www.soundaboutmusic.com/brand_view.html?brands_id=245 . At any rate it would be a lot cheaper to find a DSOT model or speedloader model with the tremolo already in place than to buy a fixed bridge then buy a floyd tremolo and have it installed by someone else.