If you are looking for solid color whole cloth quilts I would try the Stencil Company. I always hit their booth if I go to a quilt show. If you just want to handquilt a whole cloth I would echo the person who mentioned Walmart. I recently purchased quilt fabric there that looked like piecework. I just added some plain borders to make it bigger than the widith of the fabric and handquilted around all of the printed pieces. It turned out great and only another experienced quilter might spot that it was not a pieced and then quilted item. Since piecing is not my strong suit and handquilting is I am thrilled that there is such fabric available.
The kits for wholecloth premarked quilts do vary in price if the back and binding etc. are included. I am more than willing to pay. It saves me finding a back and binding of compateable weight etc.