Know what your goals and needs are and shop around, don't buy on impulse. A higher price may or may not mean a better quality llama. Expect to pay more for animals with more training. Handle the animals you want to buy and be sure to check health records and ask plenty of questions. Most llama owners are deeply attached to their animals and will be very happy to answer your questions.
Llamas create communal dung piles and it's simple to clean up the deer-like, pelleted manure.
Local gardeners often clean my pastures in exchange for the great fertilizer. Several enterprising people around the country have dried, ground and sold the manure in small bags as specialty food for house plants. You can get fiber tested and it will help you choose stock if you are breeding specifically for fine fibered llamas. However, solid conformation should never be sacrificed for fiber quality, find llamas with both if fine fiber is your goal. If you've never owned large stock, do not think owning llamas will be like having a pet dog because it won't.