To be perfectly honest I don't know how much my bunnies cost me. I have 3. All 3 were unwanted bunnies so I didn't have any from baby age. They get unlimited hay (oxbow) which is in bags of varying sizes from concord pet supply. I feed several kinds. When one type gets low we buy a fresh bag. I feed Timothy, orchard, meadow, oat, botanical, and alfalfa (freckles only). Humma and Faith get oxbow bene terra organic pellets, when the bag gets low I buy more. Some toys I buy, some are household items like toilet paper rolls. Humma and Faith get veggies 2x a day, dawn/dusk, 3 types a day off of the hrs website list.
Vet bills are a lot. Faith is healthy, she went to the vet after she was given to me (for a check up), then for spaying. She will go again in January for her yearly check-up.
Humma is healthy, goes for his yearly in dec or jan. had one stasis episode when I left a bag of kale in his room and he ate the entire bag. That's a mistake I only made once.
Freckles is chronically ill, and has been since we adopted him in late July. He has topped $1,000 so far, and his bills will continue until he is well. Bouts of GI stasis, cecal dysbiosis, anemia, ulcer, weight loss. Lots of meds, alfalfa and critical care to put on weight. Hasn't had any food but hay and critical care since early September, but he still gets stasis.
So, if you buy hay by the bale, pellets in bulk, and comparison shop for veggies (if you feed them), I think you could keep it pretty cheap. Vet bills just depend on the bunny. Quite frankly if I chose not to take Freckles to the vet he would be dead by now.