Some places online that aren’t centered around stim/fidget toys, but still offer them:
etsy.com : good place to go for chewlery/other chewables, homemade slimes, marble mazes, and a lot of other homemade stim toys.
amazon.com : pretty good selection, often times it’s cheaper to buy off of one of the websites actually centered around stim/fidget toys though.
eBay.com : also has a pretty decent selection, often times better prices than Amazon. Sometimes you can find rare stim toys.
For any questions on where is the best place to buy a certain item, or if you need help finding something, let me know.
Also, If you know of any other blogs or websites comment so I can check them out please. I am always looking for new resources myself.