Most guys make their own from hardware store parts- use the search feature with your new membership. Basically a bolt with a few nuts, a washer and piece of pipe to slide over the bolt and into the washer. Or, some have used Vice Gripse on the top of the injector just under the threads. Carefully move it back and forth (LITTLE bit, no more than 2-3deg) while pulling up. If you spray some PBLaster in the hole, they normally come up pretty easily.
Daniel