Substitutions

Some things I have learned to substitute for in the kitchen. But how do I find a good substitution for grahm crackers? Sorry, I just don't think it's going to happen. I don't care for boxed cookies which I guess could be a substitute if I were to find anything remotely grahm crackerish, such as vanilla wafers which could be crushed, but haven't seen anything like it.  I only have 1 complete box of grahm crackers left. OH NO!!! I guess you can tell that I use grahm crackers a lot, for pie crusts for my homemade puddings that I make (and the missionaries love) and they are pretty good for snacking as well. I'm really going to have to stretch these out.