For my first marathon I think I spent $40-$50 on any and every kind of gel,chew and sport bean,I don't mean for training,I mean for the race,I had every pocket and belt bag jam packed with them.It was also the 2013 Disney full that was in the mid 80s and all you heard was how the heat would wear you out so I figured the more energy supplements I brought with me the better,I wasn't even thinking there would be some on the course.Today I'm totally off the gels,not because they upset my stomach or anything like that,I just feel they make me thirstier than I need to be.I stick to chews of any kind,for half's or shorter I just bring little bags of fruit snacks,for fulls I get actual GU chews with higher sodium content.