Online, there are many stores that sell LeapFrog LeapPad Ultra devices, the main LeapFrog site has a shop that you can buy products from. If those are unavailable, you can use Amazon to buy new or used LeapFrog LeapPad Ultra devices.
I do not sell products, but you can find chlorine tablets at most pool supply stores or online retailers. Make sure to follow the manufacturer's instructions when using chlorine tablets in your pool to maintain proper water chemistry and safety.
There are many on line stores that will sell Leapfrog Explorer. I would suggest such sites as Amazon or even Leapfrogs company page. If you want to buy used I would try Ebay.
Fry's Electronics and Best Buy has them in stock. Probably some computer stores may have them.
You can buy fizzing tablets at most drugstores, pharmacies, grocery stores, or online retailers that sell health and wellness products. Look for them in the vitamins and supplements section, often marketed as effervescent tablets or fizzy tablets.
Teavana. Or local whole food stores.
a lot of local malls sell them
Yes they do sell Kelly dolls.
Farmers markets
Proactol can only be purchased on-line from a website.
This depends entirely on the location of the questioner. In Europe, among certain local ones, some notable toy retailers that sell bikes Toys R' Us, Mattel and LeapFrog.
"Many online stores sell Paul Green Shoes. I did not find any local stores that sell them, besides actual Paul Green stores. Some bigger department stores may carry them."