The only ones I have seen (I <3 Jax) are from River City Church. I attend that church and they are a very young and civic and urban minded church. They used to meet off of McDuff at the City Rescue Mission, but they outgrew that space. Currently they meet on the Southside, but they are looking to move back to the North Riverside area very soon. For the next two months they are having weekly meetings (It's church, but it's hard to call it that. it's more of a discussion. They call it The Life Course) at Intuition Ale Works. Every Tuesday at 7 pm go to the brewery bar for a free beer (on the Church's tab) and some life lessons. I missed last week, but I'll be there tomorrow. If anyone asks, you can tell them David Paulk sent you.
Sorry for the potential thread de-rail, but they are seriously the only people I know with I love Jax stickers. Theirs are about 3 inches by 3 inches square with I and a heart on the top line and Jax on the bottom. In tiny text I think it says
www.rccjax.com, but you can't see it unless you're a foot away from the sticker. If you have seen different ones then I don't know where to get those.