Hi there,
A hard plastic carrier would be a good buy. Their not that expensive and go on sale lots at pet stores. Make sure it's long enough for a bun to lay in (best bet would to just get a medium, if you're planning for a regular sized bun -and not a Giant breed-
I have one like this for Babii,
Another good thing to have on hand is a water bowl. Some buns don't take to bottles, or the bottle causes much trouble, so having a bowl just in case would be a good idea.
A scoop is good to have, too. It's good to clean out the cage and do spot cleaning. Although, a scoop made for kitty-litter would be no good, since the slits in it are much bigger then a bunny poop (so it would be no use)
I have one like this;
Also, having the number and address to an emergency -BUNNY FRIENDLY- vet on hand would be a good idea.
Depending if you have a yard or not, either an outside 'play pen' or harness and leash would be a good idea.
http://pet.imageg.net/graphics/product_images/pPETS-5571363t400.jpg/img]
I have this leash/harness for Babii and I love it;
[img]http://pet.imageg.net/graphics/product_images/pPETS-6014313t400.jpg
Of course toys, would be ideal (pretty much necessary). Although if you're on a budget, simple toilette paper/paper towel rolls would be good.
This would be around the time of getting your bun, but some vegetables. You can check out the safe/unsafe list here;
http://rabbitsonline.net/view_topic.php?id=13618&forum_id=17/
A little first aid kit wouldn't hurt, either. Heres a list of things to consider adding to the kit ;
http://www.rabbitsonline.net/view_topic.php?id=28862&forum_id=17&highlight=kit
Hmm, this is it for now, I suppose.
Good luck! :thumbup