Who reviews "Bricks" of all kinds including Lego. He consistently is annoyed by how expensive Lego is compared to everything else, with usual worse quality (in terms of design, fun to assemble, etc). If you can bear google translate or even speak German, he may be worth listening to.
Anyway, got sucked into that and got my first "brick" set since around 25 years ago and it felt like Lego (as far as I could remember). Instructions, presentation, the stones, everything.
I believe "Cobi" and "Bluebrixx" are often mentioned as good, affordable (seems about half price for similar set) and lego compatible. From what I understand the patent for the particular form factor of the bricks ran out, which is why there are a bunch of alternative now.
I got that one: https://cobitoys.de/small-army-ww2/panzer-und-fahrzeuge/panz...
I live in the UK, think I got it via amazon, so maybe more difficult for you Americans.
If you are genuine about your inquiry, then at this very moment there are 3 supermarkets around me with a toy aisle and a discount basket which includes discounted LEGO sets (30-50%), either due to products running out or box being damaged. I'm assuming there is something similar near you.
Second, and more important, if you or someone close to you work with an organization that helps kids living in poverty, you are welcome and encouraged to contact LEGO directly and ask for help. They have several organizations and initiatives inside the group that help either by directly donating sets or by donating money for other needs.
Sadly, I suspect most of the pieces out there are in landfills or the oceans.
You could set out with a $20 bill and outfit a 6-year-old with a totally adequate set of toys, from scratch, by just walking a neighborhood on a yard sale day.
Also, an Ender 3 3D printer provides a lot of similar construction skills and learning (with the printed objects) for the price of one high end Lego set.
Set them up with an easy to use bit of cad software and show them how to 3d print a cube... Then let them 3d print whatever they want to make.
3d printers have hot parts - let them burn their fingers once or twice and they'll soon learn which bits not to touch. After that, a 3d printer is pretty safe. Test it first, but generally the motors aren't strong enough to crush a finger placed in the wrong spot.
The only downside is many 3d prints take 1 hour + to print, which is pretty frustrating for a child. You need another activity to entertain them during printing breaks.
idk if this would work for kids but it works for me! it also means that prints which are 8-10 hours don't feel long, because I start it an hour before bed time, then as I am waking up and doing my morning routine the print is on its last few bits!