Believe me its not how much people pay that makes them treat a dog better - you only have to look at any pedigree breed rescue to know that the cost doesn't stop them getting rid of a dog for no good reason. If you let the pups go at 8 weeks then the new owners should have the vaccinations done, but if you keep them longer then you will need to get the first one done. Be careful though, if you have the first one done and the new owners take them to their own vets, they sometimes want them to have the full course done again. Usually the bitch will bite through the cord and there might be a little blood, but this will soon stop and the cord will shrivel up. If you need to cut the cord, its best to squash it between finger and thumb and tear it roughly rather than cut it neatly. Try not to pull it as you tear it or you could cause an umbilical hernia. I have a link to a site which is all about whelping, I will look it up and post it. As for costs of puppies, I would have thought about £200 - £250 for a crossbreed puppy is a reasonable amount.