price of ram difference!!

Doesnt seem right . Cruicial were highly recomended & I found very cheap. Send them an email showing prices. There were very good to deal with .. delivery came in 3 days WOW , to Australia . Stunned at price & delivery. Sure you have the right one . It would seem unusual that MBP2010 , 8Gig of ram ( 2 x 4 ) cost Around $50 delivered. But you say $ 120AU per 2 gig ( $500au ) total . ASK them.

Everyone talks raw of number of modules, not pairs. The vendors are selling modules, and will describe them by the each.

Stating number of PAIRS causes confusion because many systems, including later Mac Pro do not require Pairs. If your system requires pairs (as yours does) YOU are the one burdened with mentally collecting them into pairs.

It would seem unusual that MBP2010 , 8Gig of ram ( 2 x 4 ) cost Around $50 delivered.

Those modules are completely different, and cannot be compared for price. Later modules (using a different technology) are often cheaper in price.

Modules for 2008 and older Mac Pro are REALLY expensive by comparison to newer Mac Pro RAM prices. So much so that if you need to establish a large Memory for the first time in a 2008 or older, it is cheaper to upgrade (buy newer and sell old) your Mac Pro to a 2009 or later, then upgrade to a large RAM on the new one. You save money.