My wife uses a more expensive machine for most of her quilting, but has a more portable (read cheaper) machine she takes to local quilting get-togethers. She says it's OK for under $300.

https://www.amazon.com/Brother-Quilting-Stitches-Auto-Size-Buttonholes/dp/B000JQM1DE/ref=sr_1_2?ie=UTF8&qid=1544750780&sr=8-2&keywords=brother+cs6000i