Newegg has 4GB (1x4GB) Adata XPG Gaming Series DDR3 1600 Desktop Memory (AX3U1600GC4G9-1G) for $36.99 - $20 rebate = $16.99 + free shipping
http://www.newegg.com/Product/Product.aspx?SID=C2mBKgRbEeOAhHrE6lFVEw0_aNpf3_iaO_0_0&AID=10440897&PID=1225267&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-cables-_-na-_-na&Item=N82E16820211795&cm_sp=
http://www.newegg.com/Product/Product.aspx?SID=C2mBKgRbEeOAhHrE6lFVEw0_aNpf3_iaO_0_0&AID=10440897&PID=1225267&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-cables-_-na-_-na&Item=N82E16820211795&cm_sp=
