Before I got certified, I purchased two vouchers for training at an LDS on a groupon-style site. I had checked out how much the shop's classes cost and the vouchers looked like a good deal, but it has long since become clear to me that it was just a cunning means of getting me to commit to that shop. The instructors were ok, but the money that I thought I was saving was nickel-and-dimed back via things that turned out not to be included in the course fees. Because I had two vouchers I ended up doing my OW and AOW through them, but if I had taken my time, done more research locally, and read up on how to pick a shop, I would have chosen differently.