Where to buy Kevco pans

Did you try going to the KMJ preformane site?

CNC motorsports sells them as well. std pans are m301 for a 318/340 or m302 for a 360 IIRC.
http://www.cnc-motorsports.com/kevko-m301-stock-location-oil-pan.html

Bust out a search on each site.

You were saying about ebay... :)
http://www.ebay.com/itm/KEVKO-M301-...m589a3521aa:m:mlXCD4fPSM_loB6FPNXBYMw&vxp=mtr

http://www.ebay.com/itm/KEVKO-M302-...m4d0832a0e3:m:mlXCD4fPSM_loB6FPNXBYMw&vxp=mtr

Do the vendors a HUGE favor and buy from a seller or Kevco direct. Ebay will hammer them with fees that take money out of their pocket to facilitate the sale. DAMHIK!!! They will thank you for the direct patronage.