The link dunerunner found is about what I remember a few years back... not too bad a price at $75 each
switch, wiring, enclosed quiet air pump and three different sized Lumbar Bladders
I added in seat heaters some years back so I can attest that this is a job best done with the seat out of this dinky car
Thanks
And do post if some one figures the easy way to max recline...my drivers seat is good for me but I bet my wife would like to lay back further for a snooz if we do any semi long travels