Wow.
This thread reminded me of a weighted vest we got for Dweezil when he was in preschool. These are frequently used in kids with sensory issues - same concept as the weighted blanket. His teacher had one we could imitate, but had no idea where to buy one and we couldn’t find one online (this was 13+ years ago).
So we borrowed the one from the school as a sample, bought some fabric, and took the lot to a seamstress to duplicate. Total cost, something less than 50 dollars, probably less.
I just googled this and found that Amazon sells such things targeted at exercisers - prices ranging from 35-55 dollars. Then I looked at a link listing them specifically for kids with issues - a different style, to be sure (looks more like a clothing vest)… for 77 dollars. I can’t tell whether that includes a set of weights, or whether the weights must be purchased separately at 36 dollars a set.
Either way: it’s significantly pricier than the adult-targeted one!
For our homemade one, the weights were the biggest problem. We solved that by going to a sporting goods store, spending about 3 dollars on a 5-pound box of BBs, and measuing that into individual zip-locs. That’s the one part where the cheap option was NOT as good; had there been younger kids involved that would have been a safety problem.