http://www.bedbathandbeyond.com/store/product/tempur-pedic-reg-tempur-topper-supreme-3-inch-mattress-topper/207855?Keyword=tempur+pedic+mattress+topper+twin
This is the memory foam topper I have. Very lightly used (less than 4 months), no stains, and has been cleaned and ready for sale! Retail $300, asking $150 or best offer (willing to negotiate). Will deliver to you for an additional $10. It is absurdely comfortable, and if you're looking for an affordable way to transform an old mattress without purchasing a new one, look no further!
http://www.ralphlauren.com/product/index.jsp?productId=41355306&cp=1760781.1760813&ab=ln_men_cs_sweaters&parentPage=family
This is my surprisingly soft and thick cotton memory pad. Used about 6 months, washed, no stains. It works in perfect combination when placed over the memory foam cover (and prevents it from sliding around.)
Retail $95 dollars, asking $30 for this topper. Will deliver to you for additional $10
Price for the two together: $165 (negotiable) and free shipping.