You can mailorder OEM filters for less than $7 from Randy Steele - http://www.epsparts.com. He is in Santa Barbara, CA. For those of you on the East coast, try Rusty Cullens - http://www.rustyparts.net.

Both of them offer great service and have exceptional knowledge. To avoid getting bitten by shipping costs, order a bunch at a time.

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Chris

'04 ML500 - 53k, Inspiration Edition, Desert Silver
'11 Audi A4 Avant - Brilliant Black
'87 300SDL sold
'99 C280 Sport sold
'85 190E 2.3 sold