Old PC memory and/or SSD (DE72)

I have an old PC (Intel Pentium D 820) with 512MB Memory "PC2-4200 DDR2" in it. Does anyone have some extra memory I could add in, ideally maybe 2 x 1Gb sticks of PC2-4200 DDR2 would be great? Also if anyone has a small SSD drive they no longer want please, it would be ideal to make this old PC slightly faster. Thank you for reading my advert.