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Little Bits:
https://littlebits.com/

Gakken EX:
https://en.wikipedia.org/wiki/...

Snap Circuits:
https://www.elenco.com/brand/s...

Then there are the domain specific building block electronics - Arduino shields, raspberry pi blocks, MakerBlocks, mBot modules...

And, of course, all the modules for Mindstorms, both from LEGO and third-party.

These look kind of neat, though. Price is right!

This is me, wishing I still had mod points..... That being said, following the links back to the mfr's website here seems to indicate that it's a kitchen chemistry kit. So, it's a Mr. Wizard book with come cheap "glassware" and safety equipment. Saves the company the problem of properly packaging and labeling the reagents, they can leave the warning labels to other manufacturers. Still, a bit of a cop out.

While expensive a bit better set up for the little ones (though definitely the over 3 crowd) a set of a ton of little rare earth magnets.:
http://www.getbuckyballs.com/
I have yet to have any adult or child come to the house who could resist playing with them. You make coils rings, try to get them back into a cube. The kids learn about magnetism and polarity but it doesn't scream I'm a science toy and they have fun.

On the same theme as set of large ball bearings 10mm or more in diameter are lots of fun but hard to keep track of.

for electronics
http://www.elenco.com/snapcircuits.html are a bit simplified from the old standby radioshack 150 in 1 kits but are easier for younger children.

seamonkeys are still fun though sad when they die.

Gyroscopes are still fun, though good quality ones are hard to find.

A set of rope and pulleys secured to the ceiling are surprisingly fun. It's a crane, it's an elevator for the toy bear, it's whatever the kid comes up with. I was really surprised with how much fun they have with a pulley.

Games they may not have : dominos, go

Between the time I was six to ten years old, I was given a series of electronics kits that I loved and used to pieces (rather literally, at that). The last two in the sequence that I was given were the 200 in 1 kit and the 300 in 1 kit.

After those, I hit up the local Radio Shacks for breadboards and the like, and Digi-Key when I was a teen. Radio Shack still carries some of the parts.

Between the time I was six to ten years old, I was given a series of electronics kits that I loved and used to pieces (rather literally, at that). The last two in the sequence that I was given were the 200 in 1 kit and the 300 in 1 kit.

After those, I hit up the local Radio Shacks for breadboards and the like, and Digi-Key when I was a teen. Radio Shack still carries some of the parts.

Snap Circuit Kits make good introductions to electronics. Think circuitry LEGOs.

http://www.elenco.com/snapcircuits.html

Elenco made all the old lab kits for Radio Shack. They still sell the spring-terminal ones. Here's a page where they describe them: http://www.elenco.com/prolabs.htm They are VERY nice, and the upper-end ones have the schematics only (no numbered diagrams) in later experiments to encourage you to learn how to wire the circuits based upon schematics.

Elenco has some amazing products (humorously a toys r us DIY wiretap kit linked from slashdot).

http://www.elenco.com/

They have some great stuff aimed at all ages, I took a look through, and I was deeply impressed.

I bought this kit for my son. He spends hours working on the provided example circuits and trying to improve them on his own. Everything just snaps together. Great Stuff. They even have a deluxe kit with computer interface. http://www.elenco.com/snapcircuits.html/

Try Elenco. I got a little kit to make a "clapper" (a led lights up when you clap). The box said I'd learn everything I needed to know as I went along, but I ended up just soddering everything together like it said and not actually learning much of anything. It was fun though. They have a phone bug kit that I want to get for sampling phone conversations. Everyone and his mother samples answering maching tapes, but I want the actual conversation! Anyways, I wound up getting Charles Ryan's "Basic Electricity" book, which has since taught me a lot.