I saw a used Macomber at my LYS. If you are in the intermountain west and want a BIG Macomber, check out the loom a Three Wishes Fiber Arts in Utah. She has a wide (I think 48") 16 shaft Macomber in great shape and selling for $4000. I hung the last 8 shafts on the loom after it was delivered and it worked great. It has double back beams, on sectional, one plain.
Deanna