128GB. Oops, sorry. Thought I was on the PSP board for a second. :)
The poor Vita's still stuck at 32GB. As posted above, Newegg's probably your best bet to get a new one right now (if they're still in stock) for about $80. Sony had a sale on their own store a while back where you could get one for $60, but spent most of that time without any cards in stock.
My game collection: http://chemicalburrito.com Now: Ni no Kuni (PS3), P4G (PSV), Star Ocean 2E (PSP)