G.Skill Ares Series (2 x 4GB) PC3-14900 DDR3 Desktop Memory for $34.99 shipped.  Here is a screenshot for your reference.  For the technically inclined, this RAM is compatible with Intel LGA1155/LGA1156 and AMD Llano/AM3+ platforms, features Intel XMP ready and operates 9-10-9 timing at 1.5V, which should work on most systems.