Where can you get an arm sling?

Arm slings can be purchased in most well stocked drug stores in the US. Also, Surgical/Medical supply houses often will carry a wider variety. Note too that it's pretty easy to improvise a sling in a first aid situation.

or go here this is the one i got and i was totally happy with it and got tons of comments :P

http://www.quirky.com/products/2-Ouch-Pouch?r=8b52df27064b56b36152ddfc85219ad7