Well, I'm from the US too, so although the prices might differ, I'll let you know what my fiance and I spent on my bunny.
Cage: 37"x17"x23": $80--This is sufficient for the bunny I'm keeping. You might want a bigger one if your buns aren't going to be out much during the day, or if the breed of rabbit is particularly big. Cages for drawf rabbits can be anywhere from $30 up, and for larger rabbits (you won't want a cage smaller than 36"x24"), $50. I've seen them for as much as $300, but you probably don't need anything that extravagant. Also, you can make a cage yourself from NIC cubes, which are organizer shelves you can rearrange however you like, and this can save you some money.
Food: Pellets, Timothy hay, greens: Try
http://www.americanpetdiner.com/ or
http://www.oxbowhay.com/index.sp/. Depending on where you live, the shipping will differ. For me, it would be about $40-45 for a 25lb box, and it's hard to tell just how long it'll last. If you buy from a pet store, Timothy hay will run you about $5-7 for 2lb. I got 3lb pellets for 99 cents per pound, 4 lbs Timothy hay for $6 (sale), and I expect that to last for 3-4 weeks at the rate Skittles is going.
Toys and Accessories: Varies. You can give your bunnies toilet paper tubes, make their "hideout" from a small cardboard box.. However, they will require at least some bought accessories. Make sure to get a variety of toys, as some rabbits like chewing while others like tossing and others like ones that make noise. Also, you will need a litterbox. Expect this part of the budget to be at least $25 (for me, it was closer to $50).
Litter: Can be free if you shred newspaper, or up to $13 for 5-10 lb of litter. DO NOT, i repeat, DO NOT use clumping litters (like for cats) because it can cause fatal complications.
Spaying/Neutering: $50 if you're lucky enough to have a clinic. Otherwise, expect to pay $90+.
At any rate, remember that rabbits are a big responsibility. As long as you are capable of changing their litter every 2-4 days and giving them plenty of time to run around, you're probably plenty old to own one. just remember a few things: Rabbits have fragile spines and legs. Spaying/Neutering will keep your rabbits healthy and cut down on aggressive behaviour/spraying. Rabbits need time to run around and get excercise. As long as you're mature enough to look after all their needs, you should be a good rabbit owner.