Find a Northern tools near you and buy one of their grinders. They last for years and make grinding a snap. It will be worth the money I promise you.
http://www.northerntool.com/shop/tools/product_200631877_200631877 This one is a bit different from the one I bought but I got it years ago.
You can grind any part of the chicken, turkey necks if they fit down the shoot, any part of rabbit. You can't put beef or pork bones down it but it grinds through muscle meat like a hot knife in butter. As far as the green tripe goes, I buy mine from a local groomer that also sells high end dog foods including premade raw and fresh. We have a co-op locally that buys from greentripe.com in bulk. I would contact greentripe.com and ask if anyone in your area orders and go in on the order with them or find out if there is a distributor in your area. Bravo also sells it so if you contact bravo they might be able to hook you up with a distributor too.
I started grinding because Kiva was a gulper. That little dog would swallow chicken necks whole and just barely crush up a wing. It was like that all her life. Grinding was a good solution.