TigerDirect offers the Patriot Viper 3 16GB PC3-12800 DDR3-1600 Desktop Memory Kit with four 4GB DIMMs, model no. PV316G160C9QK, for $103.96 plus around $4 for shipping. That's the lowest total price we could find by $75. It features 9-9-9-24 timings.
The Microsoft founder -- and richest man in the world -- also suggests one great book to read.