This website is full of nice foraging ideas for your parrot(s)!
It’s easy to do it yourself and with low costs!
http://african-grey.se/toy.html
A toy example with two bottle caps:
Last week I made some foraging toys for the birds.
Boxes filled with paper, plastic, toys, pellets and a muffin wrapper, filled with a delicious nut.

Closed boxes and a tie-rip through it, so I put them on the living tree or cage. That’s a lot more fun than when the box is not tethered