We also sell original brand new HP memory and hard drive. HP memory has life-long limited warranty and HDD has 3 years' warranty. 
Here is list:
376638-B21  1GB REG PC3200 2x512 ALL
376639-B21  2GB REG PC3200 2x1GB ALL
379300-B21  4GB REG PC3200 2x2GB ALL
384163-B21  512 REG PC2-3200 SGLDMM ALL
390824-B21  1GB - DDR II - 533MHz / PC2-4200 MEMORY
390824-B21  1024 MB Advanced ECC PC2 4200 DDR II SDRAM DIMM Memory Kit (1 x 1024MB) 
390825-B21  HP 512MB UB PC2-4200 1X512 MEMORY
395409-B21  8GB 400MHz DDR PC2700 Registered ECC SDRAM DIMMS, (2 x 4GB) - DIMM 184-PIN
397409-B21  1GB(2X512MB) FB-DIMM PC2-5300
397411-B21  2GB FBD PC2-5300 2x1GB Kit
397413-B21  4 GB FBD PC2-5300 2X2GB Kit
397415-B21  8GB FBD PC2-5300 2X4GB MEM KIT 
408850-B21  1GB REG PC2-5300 2X512M KIT 
408851-B21  2gb PC2-5300 2x1gb Memory Kit
408853-B21  4gb Reg Pc2-5300 2x2gb Kit
413507-B21  512MB FB-DIMM DDRII PC2-5300
PX976AA 
PX976AT               Hewlett Packard 1GB PC2-5300 DDR2-667 DIMM 1GB