I often get free veg from local supermarkets and groceries and even farmers markets. Anything they can’t sell to people they have to throw out. So lots of places keep the scraps in boxes until the end of the day in case anyone wants them. Saves wasting it. Not all the scraps are rabbit safe but it’s easy enough to sort that out. Can’t complain with free veg!
I own horses so I get hay cheap in bulk, and at the moment mostly as large rounds. So I just fill an old feed/pellet bag with hay and take it home as needed. Works out cheap for rabbit keeping, if I pretend I’m not spending heaps on horses! I would definitely recommend buying hay by the bale though, rather than the small amounts so pet stores sell. It’s fresher and cheaper.
I’ve seen lots of cheap toys aimed at cats that are bunny safe. Tunnels, cardboard toys, etc. I buy those on special sometimes. And cardboard boxes from home are great.
Definitely learn how to trim nails yourself. It isn’t too hard. And as someone else suggested, have a first aid kit handy and know how to use everything in it. Stock up on what you need for a first aid kit when it’s on special.
Oh. And find yourself a local bunny savvy vet before you need one in an emergency! Have their number stuck to your fridge, saved on your phone, etc. The sooner you can sort out emergencies, the cheaper they will sometimes be. And if you have more than one local rabbit savvy vet you can compare prices.