Mears has the Orlando shuttle market tied up. I like GO Airport Shuttle but Mears owns them in Orlando too. At least at their website it only shows a starting point for shuttles as at the airport. You'd have to call them for a custom arrangement.
By they way, this website isn't affiliated with a travel agency. We just don't allow agents to solicit or mention their agencies in the forum since it is construed as soliciting or advertising.
I'll be happy to sell you some advertising space though.