I spotted Aquafresh Kids Fresh ‘N Fruity toothpaste for $1.88 at Walmart. You can grab it for $.88 after coupon.
Aquafresh Kids Fresh ‘N Fruit Toothpaste $1.88
Use $1/1 AquaFresh Fresh ‘N Fruity printable
Final Cost: $.88
Hopefully you find the same price at your store.
You might also want to grab the cheap South Beach bars while you’re there.