Peckish

Try your local quilt shops and guild(s).

I have a group of quilting friends and we don't wait to hear of commercial retreats, we simply organize our own. We've set them up at retreat centers and hotels during their non-peak seasons, and they are quite affordable, especially if you negotiate discounted rates. The major things we look for are: a well-lit room, plenty of power for machines & irons, and private or semi-private rooms. (My group isn't into dorm-style housing.) On-site food service is a plus but not a deal-breaker.