Could they be broadcloth? Here in Canada it's usually 36" wide and come in a vast array of colours - generally solids.
It is almost always 100% cotton but has a slightly different weave to it and is usually not as thick (lower thread count per inch) as quilting fabric, but none-the-less can be used in quilts.
The great thing is it washes and irons up like a breeze, and is pretty much colour-fast and compared to other fabrics usually costs much less per yard/meter.
There's nothing wrong with using broadcloth for quilts (although SOME PEOPLE), lol get quite bent out of shape when you mention using it. It all depends on the finished look you wish to achieve.
Any way whether it's broadcloth or not, looks like you got a really good deal - happy quilting. :lol: :lol: :lol: