Finding the right king bed should be the top priority for your new bedroom. Finding good inflatable air beds is very important, because many people are taking them on road trips and vacations because they are so easy to pack.
Another reason that a raised air bed is much preferred over the older air mattresses that are down at ground level, has to do with being able to get in and out of them easily. There are always the queen size air bed units available as well. Some bunk beds have a desk built-in, or you may find that you now have enough space to add a desk to your child's room.
A mattress that is to soft does not provide proper support either. Make sure your child is happy with the bed that will be purchased as well. The celebrity bed is quite a hike in price from the other models mentioned so far, but if you want to spend even more you could take a look at the grand bed.
You can always save money by doing your shopping on the Internet; the drawback is that you can't see the inflatable air beds in person. As any pregnant woman will tell you, you've got to do what works for you.