I bought some from trimlok here in Canada, I asked about buying a 12' chunk for my door but all they sell is a 25' roll and a 50' was only $8 more, so I have a lot left over, I was going to flog some on Ebay but if this will work out for you PM me.
Product ID: WRE41B32Product: Trim-SealDescription: 7/16 O.D. EPDM BLACK BULB AT LOCATION A; 1/16 EDGE TRIM; BLACK WITH PEBBLE TEXTUre
$38 Cdn. for 12' + actual shipping cost