That's what I should do as I have rabbits too.
How much do you sell it for? The problem here is so many have free horse manure but you have to shovel it yourself which would mean you would really a truck to make it worthwhile. I think there would be a lot of people here that would pay for it by the bag that have summer homes here.
How do you seal the bags?
10 dollars a bag full of 10 gallon buckets worth. we only fill them half full so that we can fold the top over and tape it, and it works, and its what we got!