Check out Buffalo, they are about as cheap as it gets while still being quality (IMO) ram. I don't know how high it can go... have had the pc3200/ch-5 at 215 in my NF7-S rev 1.2 (dual channel), but I have chipset instability at that setting. I think it is still $90 for 512 at Newegg... not the price you are looking for, but it is an option.