What is the least expensive flooring per square foot?

The least expensive flooring per square foot has to be vinyl 12 x 12 tiles purchased from JOB LOTstores or FAMILY DOLLAR but you get what you pay for when you are looking for CHEAP. I would still buy a can of flooring adhesive when using these cheap tiles the only problem is they may only give you a 5 - year beauty life span and then after the 5 year term you may have a heck of a glue cleaning when applying a new floor unless you either cover the old tiles with new ones or tear off the first surface wood and replace with new wood before applying new flooring. It is also much cheaper if you can do most of the sweating yourself. Use your DIY Videos and learn to save yourself some money.