Today only, newegg offers the Kingston 4GB HyperX Genesis PC3-12800 DDR3-1600 240-Pin Dual Channel Desktop RAM, model no. KHX1600C9D3/4G, for $22.99. This $10 mail-in rebate cuts it to $12.99. With free shipping, that's $2 under our Cyber Monday mention of a similar Kingston 4GB PC3-12800 stick and the lowest total price we could find by $12.