I just sent off some games to trade in with Amazon this morning. It should net me about $78, which I'll use to buy Uncharted and Rayman (got my Uncharted preorder locked at $39). Sony including an 8gig card with 3G/WiFi units also saved me some cash, since I was going to buy a 16gig card, but cancelled it, since, for the time being 8gigs is going to be enough for me.
That'll actually save me quite a bit of my own cash, since I'll only have to pay for my 3G/WiFi Vita, and the carrying case.
I had initially budgeted $500 for my Vita, but I probably won't reach that, unless I guy a bunch of extra games at launch, which I don't plan on doing outside of some PSP titles I've had my eye on for a while.
I went from nearly spending $506 for my entire day one package, to spending, out of pocket, $366 thanks to my Amazon trade in, and no longer having to pay $60 on a 16gig memory card. I'm very pleased with this result, and I'll be able to buy Gravity Rush and Unit 13 when they release in March or so.
I'm really looking forward to the Vita launch, now that it's only 2.5 weeks away for me, I've entered this sort of Zen state, where the wait doesn't seem horribly agonizing to me anymore. lol. January was the hardest month for me. It seemed to stretch on forever!