Some recent tippmann a5 upgrades auctions on eBay:

NEW! Cyclone Feed Mod Upgrade Kit for Tippmann A-5 X7
US $11.29
End Date: Thursday Feb-23-2012 10:39:37 PST
Buy It Now for only: US $11.29
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TECHT LIGHTENING ROD - Tippmann A5/X7/98/Phenom Upgrade
US $24.99 (0 Bid)
End Date: Thursday Feb-23-2012 11:48:19 PST
Bid now | Add to watch list