Early bird discounts can save you tons of money. If you're registering two children for a full summer of day camp, you can save the equivalent of one whole week's tuition.
Many discounts have already expired, but there are still some good ones. Here's a compilation of camp sessions with discounts expiring after March 15:
To calculate your expected benefit, you can use this template, which is based on the probability you may cancel and whether you lose a deposit.