rail pass
 

where do you purchase a JR pass?

Why don't you find it out yourself by looking up a distributor at the Japan Rail web site?

http://www.japanrail.com/3_passes/index.html

scroll down to rail pass distributors.

sorry I tried to find them online and couldn't

You can get more info about the JR East Pass and compare it with the JR Pass here:

http://www.jreast.co.jp/eastpass/top.htm

I got mine through www.jtbusa.com last year