Places like Sallys beauty shop, your local drugstores and Walmart. you just place a part of your hair in between it and press the iron down and it crimps it, it takes forever, for me at least,
Agreed with Kayla, but I got mine at a thrift store for $2.50 & it works great, so you might wanna check out thrift stores also. c:
You can actually use a straightener or curling iron to make your hair crimp , just like a crimper would.