Our reservation system uses a pricing mechanism that raises rates when inventory numbers fall below a certain threshold, typically 20 or so boats). Things start to get a bit chaotic when we're close to sold out so this demand based pricing does two things - 1) Encourages people to look at alternative dates and 2) makes it more likely that if you're absolutely desperate for a canoe, there are more likely to be at least one or two left. This matching of supply and demand is what happens when you let an economics major run a canoe company.