If you really want a 7.9, and they have one in the size you're looking for, you better go for it. The chances of you finding another one are slim.

Trek dealers aren't allowed to sell a new bike over the phone and then ship it, you have to go into the store and buy it in person. When my '07 was stolen in August of last year, I went onto Treks website and got the phone numbers for the Trek dealers in my area (central PA). When I found that none of them had a 7.9 (in any size), I called over 50 dealers along the east coast, from South Carolina to Vermont. Nothing. I thought for sure I'd find one around NYC or Long Island, but no one stocked it in any size. I starting calling bike shops in cities all around the US that friends or family lived near (because someone had to go to the shop to buy it). Chicago, Oklahoma City, Orlando, Houston, Phoenix, Las Vegas...nothing. I finally found a bike shop in Redwood City (just outside of San Fran) that had both a 20" and a 22.5" in stock. My sister lives in San Fran, so she went to the shop and bought it, and then they shipped it to me.

I'd like to by a 17.5" for my wife. Where is the bike shop located?