Has anyone bought the discounted yeast at the LHBS? You know, the liquid yeast that's past it's shelf life? I've been brewing for 11 years and I've always avoided it. Today, I gave it a shot. I'm brewing a Saison, and I already have a pack of the Belle Saison yeast, but there was a vial of the white labs Saison blend in the discount pile. I figure that my cell count is fine with the dry yeast, I would try the Saison blend, just for added complexity.
When I got home, I plugged the yeast (by manufacture date) into the Mr. Malty calculator. This yeast had a "best before" date of 9-22-13, which means it was manufactured on 5-22-13. The calculator had it at 10 percent viability, but it appears that 10% is as low as the calculator goes, so it could be less. The thing that gets me, the yeast was only 25% off! With such low viability, it should be 75% off. Anyway... Lesson learned, stay away from the bargain bin.