To make more money at your next yard sale, sell refreshments, too! Watch the sales for a few weeks before your event, and stock up on canned sodas at bargain prices. The day of the sale, put them in a cooler with ice and put up a big sign "cold drinks, .50" or whatever price lets you make a little profit, but keeps the price appealing.
For early mornings, you could put coffee in a thermos or carafe and sell cups of coffee -- but then you would have to deal with cream & sugar, trash, etc. One year I went to the bread thrift store and bought two dozen donuts at $1 a dozen, then sold the donuts at my yard sale for .25 each!
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