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Re:Log-structured file systems: There's one in every SSD by bliving on Thursday October 01, 2009 @01:55PM (#855416)
Acard (acard.com) sells battery backed RAM/CFcard solutions for well under $500. There are compromises. It will fit your budget, but may not fit your needs.
Re:Log-structured file systems: There's one in every SSD by dejb on Thursday October 01, 2009 @08:07PM (#856125)
Thanks for that. This page has a clearer description than the companies web site.

http://2xod.com/articles/ANS_9010_ramdisk_review/

Seems like it wouldn't be too hard to build this into motherboards so you could essentially have non-volatile ram for whatever purpose you wanted.