I bought a rebreather when gas started to be hard to come by.
A guy I know did that. Bought a brand-new, fully-optioned Meg, plus the training. I think he said he paid around $14K or so, OTD for everything.
I dunno, but for where I'm at in my diving career, $14K buys a LOT of helium.
(I've got nothing against rebreathers, I just think that the gas cost/unit-cost break-even point is too far off for most people.)