I see that Cook’s Illustrated is one of the sponsors here, and I have been trying to find an “Essential Kitchen Equipment” item (Aug 2009 issue), the Lincoln Foodservice 13 gauge half size heavy duty sheet pan. I thought I found it at Amazon.com, but the thing warped so bad the first time I used it (375 degrees in a home electric oven, not a good thing when roasting off bacon). I used to have a half sheet pan from Williams-Sonoma, fabulous!! But it was starting to wear (the finish was starting to come off) and they have changed their design, that one warps too!! Maybe someone can give a home cook some suggestions where to find a heavy gauge half sheet pan that will not warp?