Okay, here is our particular situation, we had a 20x30 concrete slab poured last year by one company, another company finally got around to installing our 20x30 steel building on the concrete this year.  

We are going to use the building for a combination storage building as well as an area for my workbench and tools, there will be no cars going inside even though we do have a roll up door as well as a walk in door.

The concrete surface is unsealed and at the time it was poured they did not ask if I wanted a vapor barrier underneath and at that time it was not even something that I remember even being an option to consider.  (I plan on doing the moisture test I read about online of taping a piece of plastic down for a day or two to see if noticeable moisture is underneath afterwards)

Now we had already put a lot of money into both the concrete and the building and both projects were done sub-par by the respective companies and we had to spend extra money and time and effort to fix their mistakes and my wife wants a floor over the concrete but after all that she does not want us putting a lot of money into a floor.

We do not want paint as I have read about issues with paint peeling, my wife wanted vinyl sheet roll flooring to put over the concrete but wanted me to try to find some from a discounted closeout warehouse, I have seen even Lowes or Home depot have it as low as about $1 sf but she wanted cheaper than that.

What is likely the lowest per sf price I could expect to find ?

50 cents a sf ? 35 cents a sf ?

I have some various sizes of outdoor carpets I was going to space around where storage shelves were not sitting but she seems to prefer if I could cover the entire area with vinyl sheet roll flooring.

We are not cheap, but I am retired on Social Security and have already spent a lot on this project and she is hoping I can find a really good discount on vinyl sheet roll flooring.

Thanks in advance for any ideas !