Check the For Sale section of the forum. There are a few 40ths for sale. There's even one with less than 3000 miles from Cincinnati (BrickyardZ), if I remember correctly. Remember, these 40ths don't have nav or a working foglight, unlike the Canadian ones, and they only come in 6MT in the US (in case you had your heart set on an automatic).
Here's the link for you:
http://www.the370z.com/370z-sale/