The price really depends on what rabbits are going for in your area. Here they range from $9 for fryers up to $25 for proven (yet still young) breeders. They sound like typical New Zealand whites by his discription. One bit of advice though, you will need more cages! I suggest having one cage per adult, plus at least two extra (one for each gender of kit). If you plan on keeping your litters seperate, you'll need even more.
Since it includes three cages and babies it sounds like a fair price to me. You will need to be careful of how old the current kits are. If they are too young, they may get neglected or die from being moved to a new environment. Also, if the two does are bred, they may loose their current pregnancies because of the new environment. Be prepared for this.
Keep us updated, and good luck! Raising rabbits is a wonderful hobby!
Emily in NC