Yeah, it does sound a bit rich. On my 1997 SL2, I replaced the valve cover gasket myself for $34.38 for a Felpro gasket set and tube of Permatex sealer at Advance Auto Parts. The kit includes the molded gasket for the cover, gaskets around the spark plug holes, and grommets for each bolt.
Maybe a Gen-U-Wine Saturn part costs more.
The labor seems low, based on my experience, but then I took additional time to disassemble the vent boxes in the cover and clean out accumulated crud. Personally, I hate to put the cover back on dirty for no other reason than to make sure the sealing surfaces are clean, but it's also an opportunity to clean up the insides of the engine just a little bit. To just swap out the gasket and put the cover back on, dirt and all, doesn't take long.
RK Henry