Laptop RAM Memory DDR2 1GB 2GB

I have several laptop PC2-5300 and PC2-6400 DDR2 RAM modules, as well as other types. I have 512MB and 1GB modules. 1 x 1GB RAM module – €4 each. 2 x 1GB RAM modules (1GB x 2 = 2GB) – €7 per pair (€3.50 each). 1 x 512MB RAM module – €2 each. 2 x 512MB RAM modules (512MB x 2 = 1GB) – €3 per pair (€1.50 each). I accept exchanges (I can provide up to 4GB total RAM) for each 2GB module.