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I feel like this is an opportune time to make a joke about wives/girlfriends, but the closest I've got is in the picture below. They're expensive, but not really too much of a puzzle.
The most expensive cube that I own right now is a pillowed Yuxin 11x11. I purchased it used and got around a 70% discount, so I can not say that I bought it for retail price. Still one of my favorite cubes in my collection, even though it locks up and caches a lot.
Amazingly just 8 dollars for the Angstrom X-man Galaxy Megaminx that I got when Chris was liquidating his stock in preparation for the merger with theCubicle (although I have a more expensive puzzle [X2/X-cube master] that my brother won in a raffle).
As of now:
V Cube 7: when I paid for it back in the day, it was $50!
However, the Shengshou Gigaminx was $35-40 and still retains value.
Then would be the Chinaminx, pictured left, I don't know what it's valued at but it's priceless to me.