Went to Target today...yes, they are selling single sheets, flat or fitted. Didn't really have the colors I wanted, but I ended up getting fleece throw blankets...king size, $21.00. I am now able to do what I had planned.
I also looked at the king sheet set, the fitted was 90 x 80 I think and the flat was 108 x 108 I think. So to me the king set priced at $20.00, I think, would have been a waste, because I would have only been able to use the flat sheet, not the fitted because it would have been to small for what i needed.
We used to have a Springmaid at the outlet mall....not any more....
Thanks to all for responding....