Glad to help athensy, only stupid question is the one you need to ask but don't!
The "sodium" nature of the laptop RAM always makes it more expensive. In addition, anytime demand falls for an older product, the price tends to rise above the newest "hot-selling" RAM due to economic reality. In order to keep making older RAM, the makers charge more. The price per GB of RAM, like hard drives, falls the larger the item, until reaching the peak of technology, where it rises again. So that 256K RAM costs more per GB than 2GB RAM; a 120GB hard drive costs more per GB than a 640GB - but a 3TB drive is more per GB being new tech.
I recently purchased some 1GB DDRs for an older Motherboard, paying about $42 per module for a total of $125 for 3GB. They didn't work and I ended up getting a brand new M/B and 4GB RAM for it for the same price. The 2 2GB modules cost $50 compared to 3 1GB modules for $125.
Good luck and hope your upgrade goes well.