Just bought the Kelty Noah 9 from Campmor.com - $50.00.
I have been looking at the Neo tarp, which I believe is 12'x12'. That one is just way too big for me - diagonal is just a hair under 17'. The 9'x9' is a smidgen too small with a diagonal of 12.72'.
The Kelty Noah 9 is 10'3"x10'3" which gives a diagonal of 14.5'. Not too small and not too big.
Also, not the lightest thing around, but for that price