5 pack of keg post and dip tube o-rings - $5.50 Shipped

5 pack of ball or pin lock keg dip tube and post orings.  $4.50 + $1 shipping.  Shipping for additional sets is $.15 per set.

via eBay.  This is a "Buy it Now" item from a seller with great feedback. 10+ are available.  The item and seller qualify for eBay Buyer Protection.

Full details here

5 Homebrew Beer BALL or PIN LOCK Cornelius Keg Post & Dip Tube GREEN O-ring Kits - $4.50 + $1 Shipping

Also Consider:
Cornelius Corny Keg O-rings Rebuild Kit Beer-10 pk PLUS A UNIVERSAL POPPET - $18.99 + $2.95 Shipping

You could also save some money by buying these in bulk from a place like McMaster.

Related: eBay, Draft, Keg Parts

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