The best type of purchase for this scenario would be a consumer-to-consumer auction site. These sites allow anyone to make a publication selling their product. This publication can be seen by anyone around the world. It is the best way of finding the cheapest prices for a specific item. The condition of the items on these sites can vary. The majority of the time they are used items in good conditions, but can also be new items or very worn out items being sold for parts.
The person can keep up their bills and payments and send them off in time. keep your balances low and try to never go into debt. I you do get into debt than pay it off when you get the chance instead of forgetting about it.