You can get those from camping and safety stores or even online such as ebay or amazon, being websites that sell general goods they would have a lot of different types as well for you to choose from.
Some of the great options to check for womens reflective running gear are athleta.com and roadrunnersports.com. Along with these, you can also check amazon, brooksrunning, sweatshop etc.
Target carries a lot of running gear for women. Their prices are quite affordable, too.
The answer is no, you do not have to wear reelective running gear while participating in a race. However, it is much safer and required to wear reflective running gear during early morning races or evening to night time races. You can find reflective running gear at runnersworld.com.
If you're interested in finding information about or purchasing running reflective gear you can visit http://www.roadrunnersports.com/rrs/gear/gearsafety/ Safety is a priority when running, so having the right gear is ideal.
It all depends on what kind of reflective gear you are looking for. Swimoutlet.com has cheap reflective vest while http://www.roadrunnersports.com has cheaper reflective bracelets.
They can purchase the running gear on their online website or inside the store. I also think many other big named stores carry the running gear the person needs.
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.
Brand names and their websites usually will contain this type of informative material. When you pull up a product, it will most often have a description below.
Running gear for woman can be purchased at the following websites....www.adidas.ca/ or www.roadrunnersports.com/ or ww.runnersworld.com Running Shoes & Gear Apparel & Socks
www.runnersneed.com and www.prodirectrunning.com have a good range of reflective gear. But I would recommend Amazon because you can compare prices and brands and see reviews of people who have already bought the products.
To enhance visibility while running at night, incorporate reflective tape into your gear by applying it to clothing, shoes, and accessories. This will help increase your visibility to drivers and other pedestrians in low-light conditions, making you safer while running in the dark.
Walmart has good selection and low prices on reflective gear if you are interested in picking it out at the store. Amazon.com has great selection if you want to buy online.