Since you aren't planning on remaining in the house, check with a local carpet store for remnants or damaged carpeting. Sometimes carpeting from the factory has flaws which can often be cut out. It might require an extra seam or two where the pieces meet, but a good installer can make those almost invisible. As long as the color is neutral, new carpeting will make a huge impact on the appearance of your house.
I just bought peel and stick vinyl from Home Depot for my utility room. I got the "Carrera Marble" pattern and it looks great. Very neutral, low gloss, and looks like it will be durable. 30 square feet for $30, and it doesn't take long to install.
Companies that redo bathtubs will do tile as well. The ones I've seen look great--don't know how well they hold up over time, but they look brand new in the beginning.
Make sure to get rid of clutter (including drawers and closets) and remove photos of people before showing your house. Clean, clean, clean makes a big difference as well. It's amazing how many people do not do this, and the ones who do sell their homes faster and for more money.
Best of luck to you in getting your house ready--I hope it sells quickly. 
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