Where is the best place to buy memory for my Compaq Presario computer?

My computer run on Windows Vista.

Answer:
as said up to that time .. go crucial.com will inform you what memory u need since ur not stating the model number..

that will communicate you the type of memory u need ddr / ddr2 etc

as for buying stale auction sites.hhmm hit and miss.. some ppl sell imperfect memory, i always buy mine fresh.
Best Buy!
Or, if you have some local computer seller, go through them. They may know how to customize it a bit more.
Try ebay. You need to supply more details...What type of RAM does it take? DDR..SDRAM.it is also especially important that you know which companies your motherboard will not work near.
www.crucial.com
Try Best Buy.
Once you figure out what RAM to acquire at: www.crucial.com, go to www.pricewatch.com to bring back it for the cheapest price. If you think the retailer looks fishy, you can always check them out at www.resellerratings.com.

NOTE: Laptops simply have 2 slots and they are usually both occupied, so you need to replace them, so form sure you buy the amount you want without tally to what you already have.

AND: If this is desktop model from a "big box" store, even those own only a few slots (either 2 or 4); so build sure to check to see if there are slots available. PLUS: depending on the processor and motherboard, you may entail to buy RAM in pairs, so read the "upgrade RAM" instructions that come with the PC.
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