I feel your pain....I was paying someone to quilt my quilts....cost for a baby blanket $40.00....and I've paid as much as $120.00 for custom Queen....
Dad has a machine now and I can quilt my own...but let me say he has a Gammil......not the most expensive one but it did cost $15,000.00.....and that was used....not counting the light system....table was included.....So now maybe you can understand more why it is so expensive.......and if they do a great job which I hope they do you will be happy I hope.....it is a gift to be able to use a Longarm Machine....:-)
Just letting you know....:-)....don't forget thread and bobbins and the batting and backing for those who don't come with it....:-)