Sorry for your loss.
I agree with Aki though, her death may have been due to issues with pregnancy and nursing.
Petfinder.com and petango.com, to my knowledge, only list animals from rescues or shelters.
Here's my 2 cents on background:
Petshops and backyard breeders can be a "mixed bag" as these rabbits are generally not bred for health and temperament. Therefore the chances of such a rabbit living as long as one that is bred for health is less. But that doesn't necessarily mean they won't.
To me, a good breeder will breed to improve the breed(s) he or she breeds, in overall breed standard, and health and temperament. He or she should be willing to help you in any way he or she can, including possibly taking back a rabbit if needed. That breeder should welcome any information about hereditary issues that come up in any of his or her rabbits, and take appropriate action to help reduce or eliminate that issue in the future. These rabbits will generally cost more, but are less likely to have health issues in the future.
Regarding adopting an older bun ... think of it this way ... you've given the bunny a chance to live a good life where it may or may not get otherwise. I "took in" an angora rabbit recently I was told was 4 - 5 years old and has probably not had the best of care. He has probably lived on wire his entire life, has sparse hair on his underside, legs, and even on top of his neck (skin looks fine, though), wasn't litter box trained, and I'm not sure if he had much out of cage time to run around. He has a bit of trouble getting in and out of the litter box. He just sits there on the floor when I've tried to give him some time out of the cage. He also seems uncomfortable when he tries to lay on his side. I suspect he's an older bun. He has a vet appointment in about a week to be checked over. I had planned to try to rehome him, but he is such a sweet rabbit I may end up keeping him.
We had him for 11 long, wonderful years!
