Luckily, there are massive resources out there for you. Try shopping Amazon.com's gluten free section if your local stores don't carry gluten free items much. They run specials and you can buy in bulk to save money.
Also, one of my favorite blogs is:http://www.adventuresofaglutenfreemom.com/ She is a lovely lady and answers questions quickly. I follow her on Facebook too - she's a great resource. I think she does a weekly menu swap on her blog too so you can start to find other blogs. I find those are the best because you're going to get the same advice over and over and get it down pat, but it's nice to follow blogs that will give you creative ideas and money saving tricks!!
GF doesn't have to be expensive, but it can be if you want to go down that road.
I'm sure it can be really hard on kids, so at first you might want to get the gluten free bread and send him to school with normal looking lunches. Then again some kids like to be different and I've heard of moms sending them to school with sushi or spring rolls even (if you only use veg they travel well!)
I have a blog dedicated to eating GF without all the packaged foods, if I can help out let me know too! I pack myself a lunch every day to go to work, so I've gotten a little creative.
I did a food stamp budget project that might give you some ideas too. I can't take credit for the concept though! cocoasglutenfreeplace.blogspot.com/search/
Good luck and let me know if I can help. I also have a friend whose little boy is gf cf and I'd be happy to ask her for some tips, if you'd like.
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