They usually retail for $7.99 at the LEGO store, but online is sold out. I was really wanting to try a few things- Jello, ice, gummy candy, crayons, so I did some digging and found them on Amazon for $24.99.
Triple the price? Not happenin'.
I then stumbled upon the coolest place. Thank God Kayden is not old enough to surf the net, or I am sure my credit car would be maxed.
Brick Link is the unofficial marketplace for LEGOs. I ended up finding two of the ice cube trays on there for $9.00 shipped. One word of caution- some of the sellers are international, so the shipping can get pricey. Any and all LEGO set you could ever dream of is on this site.