I'm from South Africa, so your situation may very well be different, but you could at least look it up. When I have kits that won't sell I take them to petting zoos/touch farms. They don't pay me for them but they're usually happy to take them on and it gives the kits a home, and I don't have to cull. They at least get a chance, in my opinion. I've gone to a few, and not all care for the rabbits humanely, so do some looking around before you give kits to them. I like to go back and visit them later, too, to check how they're getting on.
Otherwise, join online groups and forums, keep your online presence strong, and post flyers. If you can't sell to a pet shop, maybe a pet shop could at least recommend you to buyers looking for rabbits when they're out of stock.