prices are very dependant on location--what you may be lucky to get $45 for in one area may easily get $200 somewhere else. so you need to do a little (market research) for your area- contact (or visit) some lqs', call long arm quilters in your area and ask what they charge for their services for quilts you are considering making to sell- then you can add in that amount to the over-all price. keep track of material costs-
you can base your prices on a (time basis) (such as $20 an hour - 3 hours - $60)
or you can base your prices on materials + time x 3 (just an example)
or a combination of the two. but you should start with finding out what others in your area charge.
my mother used to have a stand every summer at a local weekly craft fair- when she started she took a couple of my quilts- they sold fairly well the first year (mostly twins- mostly about $125)
the second year a different lady set up a booth- she simply took panals, put a batting and a back- some simple stitching across the top a folded forward (self) binding- charged $45 apiece for them and that was the end of my selling any quilts at that location- that summer.
did not matter that my quilts were pieced, detailed- well made- and not out of walmart fabrics...
that one person (who had other items besides her small panal quilts) managed to be the reason for 5 other people with booth space give up and close up- she undersold everyone-
turned out she was not allowed the next year- the (folks in charge) found out that she did not even make the (stuff) she was selling (one of the rules of the venue) but was picking this stuff up for pennies on the dollar somewhere else.
i do not think it is advisable (or ethical) to undermine everyone else to make a buck- i try hard to base my pricing for everything i sell to be right in the 'ball-park' of everyone else's pricing- not to say i charge the same- just comparable.