I would advise against looking for your bike in any department store like Target, Wal Mart, or K Mart. While they have bikes with the same features as good touring bikes, they are less efficient machines.
I would phrase this a lot more strongly. DO NOT, under any circumstances even consider buying ANY bike from K-Mart, Wal-Mart, Target, etc. They are a lot worse than just "less efficient".
I've tried to adjust several of these things for friends who didn't know any better and found them so substandard they never worked properly.
Go to a reputable bike shop or a place like REI, where they sell good bikes, can recommend a model that is suitable for your intended use and will fit it to you properly.
I found out the hard way myself back in 1984. I was planning my first long tour by bicycle, and was ignorant about bikes. I went to the department store, bought a ten-speed for little money, and began my training rides. I used to put a weight on the rear rack to make the pedaling more strenuous. I talked with some more experienced cyclists about my intended tour of England, Scotland, and Wales. A couple of them asked in an obvious sort of way, "What? You're going to tour on that?" Well, I got the message and took me to the library to do some research on bicycles and bicycle touring, and this opened up a new world to me. I had no idea there was so much information on bicycles. I did my homework, and began a new search for a "real" touring bike. I ended up going to a town 22 miles away from my home to buy one. In those days, 1984, it cost about $160.00 to $190.00. Not top of the line but obviously a much more efficient machine than the department store bike. The whole feel of it was superior to the other bike. It was really easily discernable; a much better product.
Can you cross America on a Wal Mart special? You can. You can also walk around with lead boots on your feet, but what would be the point in it? You can enter a souped up car race with a four cylinder jeep too, but it would not be the appropriate machine for the intended purpose. The same with a department store bike. It can be done, but if you do it, you are using the wrong machine. Scrap going to department stores looking for a cross country touring bike.