I have found S45 consumables at harbor freight but I found them really cheap direct from China on e-Bay ($1 per tip and electrode, retaining (outer) caps $4. I have just ordered them so it will be several weeks before I receive them.

http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWNX:IT 22 piece kit 1 Nozzle retaining cap 10 electrodes 10 tips 1 Wire Standoff.

Thurmond