bnewlands32 :
I don't have a lot of spare money right now so should I buy a single stick then in a few weeks buy another?
I don't recommend this. Mixing memory is hit and miss. Even two of the same sticks may not be compatible with each other. Even if they're compatible enough to boot, they may produce seemingly unpredictable behavior and general system instabilities. I call this a ghost in the machine.
The only way to guarantee that multiple sticks are compatible with each other is to buy them as a kit.