I get my pins in bulk from an online supplier. But you can get them from a tractor supply store. They sell needles that farmers use to inject horses and pigs. They are just the same. Tell them you have a bull mastiff that you want to give a tetnis shot to or something. You can get them at pet related stores but not pharmacies. If you need that many though just bulk order them. My buddy was stupid and he started his cycle while his pins were on the way. We didn't know about the pet supply or tractor supply stuff. He used the same needle three times. By the third time it was duller then a spoon. LOL. He didn't get infected but I guess he was lucky. Cleaned it w alcohol before and after every use.