Go get a pack of basil in the produce section, some cranberries and, a bag of baby carrots you can cube up for treats. Your bunnies will be healthier for it and, if it's more than the rabbits need, the humans can eat those things too.
You could also plant a window box with basil, mint and garlic for rabbit greens and human use as well. Economical, gives you and rabbits fresh herbs and, pretty plants for the house too.