http://www.msspray.com/Client/page2.asp?page=128&clef=55&clef2=22

 Don't believe their website about only x-folding booms, it's crap.  They've got all kinds of options that aren't shown.  Call 'em up, ask for Jean-Luc and tell him what you're interested in.

 -edit:  Careful of big 3pt sprayers with the booms mounted behind the tank if you have any hills to spray.  Can't remember the tractor exactly (7230 Deere I think), but I know of one fellow using a 300gal with 60' hydr front folding booms that ended up pointing downhill when he was supposed to be going up because it wasn't enough tractor and he said he had all kinds of ballast up front (no loader though).  Big booms put a LOT of weight far out from your 3pt.