Here's a set for the front. I am pretty sure the 8t and 8b shocks are the same. Atleast AMAIN list the same front shock body for the 8t and 8b.
http://cgi.ebay.com/LOSI-8IGHT-T-FRO...1%7C240%3A1318
Usually there are some chop shops on ebay that sell the front and rear seperately. I couldn't find any of them listed today though. They usually list once a week.
Here's one of them. I've bought from this one before.
http://cgi.ebay.com/NEW-TEAM-LOSI-8I...1%7C240%3A1318