The cheapest I have seen the pads is about $15.00 for 4. The washers, themselves, must be at least $2.00 for 4 and the toggle bolts have to be at least $4.00 each so I question your figures.
Hockey pucks (@ $1.29) seem to be cheaper than those pads.
Try;
http://97vette.com/howto/liftpads/index.html