Can you quilt some of them yourself? I would use a walking foot and do wavy lines, which is very fast. To cut down on bulk under the arm of the machine, I would leave the top and backing fabric intact, but carefully cut the batting into sections. Here are some links that would demonstrate what I am suggesting:
http://www.bijoulovelydesigns.com/20...-tutorial.html
https://www.candiedfabrics.com/2013/...ing-as-you-go/
https://www.candiedfabrics.com/2014/...go-no-sashing/
Are these quilts that need to be quilted before Christmas? If so, you may have difficulty finding a longarmer who would be able to fit them in. Many longarmers have waiting list around this time of year. Mailing can be an option, but it does add to the cost and there is always some risk involved with the mail.