Lets make buying a bed frame a little easier than wandering around a department store trying to choose what you might think you need. Visit Homeandliving.com which is an online furniture site that sells bed frames and take a look at what is available.
They offer every size and configuration that you could possible need and then some! They even offer free shipping and no sales tax! One that caught my eye was a Daybed 39" x 74" with Fold Under Legs and Pop Up (Duo-Riser). Your kids have a friend over and you don't have to worry about a place for them to sleep!