which carrier for breastfeeding

I want to find a carrier that I can nurse on the go in. I have an ergo and a moby wrap, but for both I have to sit down and support my LO with my arms. I'm contemplating getting a ring sling. My husband is like, you want ANOTHER carrier? Well, I know it is a bit excessive but I live in a city and walk everywhere and they truly serve different purposes. Do any of you nurse on the go using a ring sling? Should I buy one or give up on my dream of breastfeeding while grocery shopping?