I’ve given stuff to that charity in the past, but these days, I’m more likely to donate to smaller, local charities. Not that TfT has any issues, just that the smaller ones seem to need proportionally more help. For example, someone we know is connected to a particular community organization that’s just looking for toys $10 or less, for up to teenaged kids.
That said…
To find donations, we typically look for stuff at discount places like Ollie’s, or Half Price Books for books and related items, including gaming books. Decks of cards and classic boardgames are pretty easy to find in that price range. Sporting goods or department stores will often have some kind of footballs (legit or Nerf), basketballs, or frisbees in that price range. Then there’s perennial faves like Matchbox/Hot Wheels etc. die-cast cars (and other vehicles) which can still be found under $1.50 each- under $1 on sale.
Department stores will also have inexpensive plush toys. I know Kohl’s sometimes has plush toys under $10 near their registers, some paired with little books.
We’ve also bought things at craft stores like sketchbooks & coloring books and colored pencils* or crayons for creative outlets. Some of those stores also have plastic/resin toys of people, creatures and even fantasy monsters.
* those last longer than colored pens.