Holy crap! If you have very many of those you may want to contact Lawrence/Livermoore Labrotories and see if you can borrow their vacuum chamber for awhile.
A buddy went to Michaels and got a bunch of the old-fashioned jars that are hinged and have rubber seals. The seals are replaceable and the jars will EASILY hold a bud the length of your lower leg. They weren't cheap, but he's used them for over 6 years and never even had to replace the seals.