The kids choose their own tools -- spend their own allowance on their tools -- and the tools get added to their own tool box (actually, a bucket).
My haul was modest (see left). One trick I learned from my paternal grandfather was to leave an often-used tool at the location that you use it. For example, he had a specific size screwdriver hanging next to the furnace door, to facilitate changing the filter. In my case, I was looking to pick up a crescent wrench of the correct size for my bench grinder -- for around 50c. I'd duct-tape it to the power cord, so I'd always have it handy. I also wanted an inexpensive adjustable wrench for my workshop, since I keep my ''good'' set of wrenches elsewhere. And, as you can see, I found 'em! I think they were 50c each.
My youngest son picked up a broken section (!!!) of a 45-45-90 drafting triangle, and an old-timey crescent wrench. My daughter picked up a masonry drill bit, and a hooked pulling device -- which she'd strike with the masonry bit to get a ''ting'' sound.
As usual, my elder son (twin to to my younger son) had the biggest stash -- but also spent the most money. He got an old-timey double-ended crescent wrench, a newer (inexpensive) double-ended crescent wrench, a bent screwdriver, another old-timey crescent wrench, a pair of pruners (potentially dangerous -- but I don't allow them free access to their tools), and a disposable box cutter (again, he can use it when he's older).
Here's some snapshots from the previous trip -- possibly in May -- that I just haven't posted. Here's The Girl's stash: a Phillips screwdriver and a C-clamp with the pad missing.
Here's B1's haul: four sockets (he doesn't yet have a socket wrench), a combination wrench, two screwdrivers, and a chisel.
And, here's B2's stash -- again, the largest of the three. A combination wrench, five screwdrivers, a caulking gun, and a pair of needlenose pliers.
Trying to teach them the importance of having an adequate stash of tools.
When they get older, we'll start being more methodical about it. :)