For all the new gTLDs you can go to nic.tld to find WHOIS info and usually a list of registrars. In this case nic.foo goes to Google's registry, which doesn't seem to offer the TLD for sale yet (or if it ever will).

Ask Google to let you. http://arstechnica.com/business/2012/06/blog-lol-foo-google-...

Namecheap & others are trying to scam you.