Adopt an animal at local zoo (depends on local what price) and send book/t-shirt w animal or admission for zoo.
Movie w popcorn treats.
Small tool box w easy kit to build (i buy kits at lowes and tools at dollar general).
When DS19 was that age, he received a cake pan w all the ingredients (minus perishables) for his favorite Butterfinger cake.
NERF blasters are super popular w the neighborhood kids.
How about one of your favorite books from that age? Hardy Boys, White Fang, Johnny Tremain...
Hope this gives you a bit of help.