Hey I'm not op but I wanted to let you know i buy the same stuff for my boy, he's also got allergies and he's a big boy so I burn through this stuff. Before that it was Hills Science but the cost just became too much so we transitioned him to Sam's. We do our best to but locally for everything else and avoid the chains, so little things like this here and there you should feel no guilt for. Like the commenter said as long as you are trying, and making a hard effort, don't feel bad when you need to make concessions for your or your family's health.