I definitely would check their work. I keep my prices equal to the lowest around because I live in a rural area away from the city and I charge $.015 per square inch. Take the length times the width to get the square inches and see where they fall in line with what I charge. I also charge $1.00 per bobbin for pre-wound bobbins that way the denser the pattern you choose the higher the cost and vice versa.
I love to quilt your quilts but I refuse to work for less than minimum wage just to say I am busy.