Old RAM 533/667 for desktop

I am selling used computer RAM, including ProMOS PC2-4200U and Patriot Memory PC2-4200 or 5300 modules, all 512MB. These sticks are pulled from working systems and ready to give some older machines a bit of a boost. * 512MB Capacity * DDR2 * Speeds: 533MHz and 667MHz Given the age and niche use, I'm asking $5 per stick, or best offer!