Hi Meg
Congrats and thanks for starting a rescue-they are definitely needed.
I’ve got some money saving ideas for you, sorry if you’re already doing them!!
Do you have vets doing discount/probono/atcost vet care for you yet? Have you been able to look into it? Often they can give rescues cheaper or free vet care. That may help with the credit card. If not, try phoning (or having a volunteer phone) around to request some help from all the vets in the area. Offer to recommend them or promo thier clinic name in exchange
Also, for your hay, can you buy hay by the bale to save money where you are-rather then from a petstore? A small bag of hay at the store here costs eleven dollars and its’s two bucks a bale, so definitley a money saver
Post on craigslist and kijji for donated items-we get lots of response through these and if you offer pickup for donations you get even more help. Also you can post rabbits for adoption on there to get your name out a bit too!
Put signs up in petstores (if they allow) asking customers if they want to purchase items from a wishlist and leave them at the store for you to pickup for the rescue.
It’s a convenient way to donate and many stores will allow you to do that, and even discount items purchased for the rescue.
GOOD LUCK and thanks again, you must have a big heart to get this going and spend so much time 