if you visit the AQS (AMERICAN QUILTERS SOCIETY) web site they have links of american registered quilt appraisers-- you can locate the list for your area and contact an appraiser to set up an appointment- the last quilt i had appraised cost $30 i do not know if that is normal or just a special offered during the quilt show i was in.
i have found it to be well worth the money to have quilts appraised before selling- i also have the quilts i keep appraised - for insurance purposes.