2x2GB 4GB kit of DDR2 CL6 (yes a bit slow) is $40 AR ($30 MIR) now at fry's. $5 shipping. Get a kit and have a friend get another for you and that's 8GB for $90 after rebates. I very much doubt that the 2x2GB kits will be much less expensive that that level of prices between now and the end of the year. Maybe someone will have a lower rebate or slightly faster RAM for the cost, but I wouldn't expect miracle price drops.
No way are 4GBy capacity individual DDR2 DIMMs going to drop to this price level per gigabyte anytime soon IMHO. I'm not even sure if they'd work on many motherboards / chipsets even if they were available at a good price.
Go with 4x2GB DIMMS for 8GB.. I've done that with Vista 64 and LINUX and it has worked flawlessly and I've been glad that I did so. I often use 4-8GBy memory in actual use conditions given just pretty normal stuff like having a fair number of browsers (yes Firefox is a memory hog), office documents, PDFs, text files, my email, various shells, etc. open at once.
There have been nice deals on 5-5-5-15 DDR2 PC2-6400 memory as well as the faster PC2-8000 and PC2-8500 rated stuff over the past few months as well. Usually you don't see the lowest prices going down too much though you do see them get jacked up to higher levels in between the sales. I would not expect a huge reduction in prices even on BF, and for BF good luck at getting 2 kits of 2x2GB for 8GB total for a super low price given the rebate issues and the order limits and the probability that the good things will sell out quickly et. al.
Anything from about $45/DIMM for the really fast high quality 2GB DIMM memory to $20/DIMM for the really cheap / slower stuff is probably a decent price range to buy.
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