Parts Source - and NOS rubber

I have bought from RockAuto.com several times, mostly MB parts. Their prices with prompt shipping are consistantly greatly better than the dealer who themselves don't always stock the parts I need. That said...

I have been twiddling my thumbs awaiting the Fuel Pressure Tester I ordered (Tool Aid TA33865 $81). When I got the RA monthly newsletter notice, I found they also have many commonly needed Ferrari Parts. voila Just checked the Bosch fuel accumulator which generally sells for $210 and the RA price is $135.

Until I get the tester and mess around a bit like I know what I'm doing...I can only surmise the accumulator is the culprit for my (common) warm start ills and find the best source.

Incidently, there is a guy (Vahid at autopartzilla) who has been listing the Bosch accumulator on eBay and keeps lowering the price. Guess he found a box which fell of a truck and is gradually trying to unload them. Looking at completed auctions with 0 buyers, he started at $186.92 then $166.92, now $146.92.

If I haven't put you to sleep by now...any idea about NOS vs New rubber diagphram rotting? Seems to me age is always a factor with rubber so NOS parts wouldn't be desireable.