I don't own a long arm yet but would love to. I have three sewing machines, a really old Viking from the early 70's, some no-name brand a friend gave me when she moved its really basic, and a new Singer Futura 250. I have quilted on these machines but ONLY small quilts such as wall hangings. I didn't care for the quality of the quilting on larger quilts. I did find a quilt frame I could use on my sewing machine. It has rollers under the frame. The draw backs however is the quilting space is only about 4 inches, and because I don't have a stitch regulator on my sewing machine my stitches could come out really short or really long if I got distracted - which is really easy when you have young children and a dog running around the house.
SO, on my bigger quilts I send them to a quilter here in town and pay her/him to quilt them for me. Your local quilt store may have a list of people who do this for a living. I took a king sized quilt to one lady including batting, and trimming it was about $150, I took another quilt an over sized lap quilt 60x72 and it was $53. When I get them back I finish them with the binding and they are awesome. I would really like to own a long arm and do it myself - someday...