You can pick up an EVO 3D from the Shack for $200 (on a 2-year contract, of course) - trouble is, no one knows when you actually go about doing that, as there's no confirmed launch date for the EVO 3D at this point. However, you can pre-order an EVO 3D from Radioshack right now, and feel at least a little more assured as to the price you'll be paying.
If the idea of being contractually shackled to Sprint doesn't really sound great, you can pick up the EVO 3D off-contract for a fairly reasonable sounding $500. Considering how much we liked it, its dual cores, 3D display and cameras, and how solid it looked overall, this seems like a fair asking price.
Additionally, you can get a $100 credit towards the purchase of your EVO 3D by handing in your old EVO 4G or EVO Shift 4G with the purchase of your new 3D. Not a bad customer incentive, right? There's more: the EVO 3D will come with a 3D version of the film Green Hornet pre-loaded, and every customer will get a free download voucher for a new Black Eyed Peas single (woohoo.)
Oh, also: Sprint's $10/month 4G premium data add-on still applies. Just so you know.