RockAuto has a set for around $26
Labor on replacing should not exceed 1 - 2 hours max.
It is really an easy DIY ......
NOTE: The little covers on top of the valve covers do NOT have gaskets, that is RTV sealant. There is a how-to here somewhere on that too .
( you can get a set of stainless steel valve cover bolts for $32.95 from
http://www.needswings.com/Valve-Cove...32vcbolts.aspx )