4GB Single-stick G.SKILL Ripjaws DDR3 1333 (PC3 10666) Memory $79.99 @Newegg

[cyberia]

From what I have seen, this is the lowest price ever on a single-stick 4GB DDR3 module. If you wanted to go beyond 8GB or 12GB total system memory on a typical motherboard, 4GB DIMMs are a must.

$79.99 G.SKILL Ripjaws Series 4GB DDR3 1333 (PC3 10666) Desktop Memory (With Promo Code EMCYXYX62)