My friends Juan suffers from celiac disease — an allergy to gluten, a protein composite found in wheat, rye and barley.  Until you know someone who can’t eat it, you don’t realize how many foods contain gluten — obviously breads, pastas, cereals, but also hundreds of unexpected products, where gluten is used as a thickening or binding agent. Just look for modified food starch on the ingredient list of everything from salad dressing to jelly beans to understand how pervasive gluten is in our everyday diet.  Finding gluten-free products becomes a constant challenge for those who can’t eat it — and finding products — particularly baked goods — that taste like the "real" thing is especially difficult.  So I was very excited to discover Glutino crackers, which taste like delicious crackers. And even more excited to find them on sale big time at Amazon.com today — $1.86 per box when you buy a case of six and choose the "subscribe and save" option! How appropriate that today is Juan’s birthday?  Happy Birthday, Juan. Hurry!  They’re only on sale through Oct. 31, 2008.