Preschool to Kindergarten Transition

My little guy is getting ready to go to kindergarten.  He's ready.  His preschool teacher says he's ready.  The kindergarten intake teacher says he's ready.  I'm not sure I'm ready.  "He's just a baby," I keep telling people.  I know it's not true, but he's my baby!

So I enrolled him in the before-school program at his school on Tuesday.  This means:

• He will be dropped off at school before school starts in the morning, and will ride the bus home (providing I can race home from work and beat him to the bus stop).
• I will need to reconfigure our budget.  This is not a bad thing.  The before-school program is less than half of what we're currently paying for preschool.  Here's to paying off one more (last!) debt.
• His last day of preschool is coming up in less than a month.  The farewells to his teachers and staff who have been there for him since he started going there at 6 weeks of age will be terribly sad.

Logan with his dad at preschool graduation

My question for you: what do you suggest giving to his teachers and staff as good-bye presents?  We were so blessed to find this day care & preschool.  They have loved my son beyond belief.  They have played with him, taught him, and shown him how to play well with others.  Their rates are very fair and the memories are fond.  So what do I do (knowing that we are still on a budget, but truly love this place) to show my appreciation to this preschool for 5 years of wonderfulness?