Troy A.wrote a review of Cutter Premium 29in Mountain Bike Tubes - 4 pack on September 21, 2012
There is no reason to pay more than you have to for tubes. No matter how conservatively you ride your 29er, if you're putting weekly miles on it you're going to have a flat at one point. 4 for $20 is much easier to eat than $10 a piece. I have run these tubes for the last year and have had no issues with them.