Wild Fire came out at the tail end of my serious
Saturday morning cartoon days, so I never saw
much of it.  Van Eton galleries is a very good
place to check with, but you may also want to 
email a couple of sellers on ebay.  I've bought
a Lone Ranger cel from smccollectibles (their
ebay user id) and they have a lot of Sat morning
stuff.  I've also bought a cel from extsearch 
(also the ebay id) and they too have a lot of 
Sat morning stuff.  I haven't seen the tapes
offered for sale, but you might want to poke 
around on some newsgroups--my husband got the 
up to date episodes of "As Time Goes By" (British
series w/Dame Judy Dench) from a guy on a 
newsgroup.  I hope this info helps you out!

Jen