4 GB computer memory available online

I am at a dilemma right now of choosing between upgrading and buying a newer laptop. My laptop currently works fine but it is already tad too slow and would not run all the applications especially the newer ones. But since upgrading most of the parts, especially the computer memory will also cost me, I thought I just might buy something new. My computer is the Apple series and of course, as much as possible I would like an original Apple memory which is more expensive than a generic module. Laptop memory does not come cheap nowadays especially with a minimum of 4 GB capacity. But since it was out of my budget to buy a newer one, I have no choice but to simply get a 2 GB module in www.memoryupgrade.pro which will certainly make it faster than it currently is now.