No worries, you can try Amazon, BHphoto, or other Apple re-sellers. I needed Snow Leopard too, so I just went online and bought a new MBP from the refurb store last week.
The problem is that copy won't work with the latest MBP.
You need a DVD with 10.6.8 and all the latest drivers.
Not sure where you can buy that, probably an Apple store
and a friendly guy would be the best bet