Look on amazon, or ebay. Some may be used, some not. Amazon is very reliable, and you can find a large variety of anything you would want. You can find things cheap too!
EMT supply stores will carry emergency kits, gloves , stethoscopes, bandages, etc. They may also carry related products like clothing, flash lights, etc.
You need an alcoholic beverage license as wine stores in NYC need to operate. You can read more at www.abc.state.ny.us
One may purchase cold weather running gear by visiting Dick's Sporting Good Stores or other athletic goods stores. Stores such as Target also carry such gear. Many stores that sell Nike gear will also carry gear suitable for cold weather running.
You can find hoverboards in NYC at specialty electronics stores, toy stores, and online retailers. Be sure to check for safety certifications and reviews before making a purchase.
There are many places to buy Fitness gear. You can purchase it online or at stores near you. There are sporting goods stores as well as used stores where you can buy it.
You can get horse riding gear at tack stores! riding gear is called "tack"
Tucson Safety and Medical Supply is a store located on W. Grant Road. They sell EMT supplies online as well, and you can browse through their catalog at http://www.tucsonsafety.com.
most retail stores
Local health supply store may carry emt supplies. Store like walmart are also good places to find emt supplies. The Buff Shop, website http://www.thebuffshop.com/, is dedicated to selling EMT supplies as well as firefighter supplies, clothing and accessories. Anyone can order online, but they do not have a physical retail store.
Shooting gear can be purchased at most gun shops. There may also be a small selection of shooting gear found at some department stores. You can also find a wide variety of shooting gear available in online stores.
One may purchase running gear from local sporting goods stores. If quality isn't an issue, one could just go to a local department store and purchase running gear there.
You can find climbing gear at almost any good sports store such as ACME Climbing. I you need a list of retail stores that sell climbing gear you might try http://www.summitpost.org/online