I don't know much about the Ashford Joy except there is a single and a double treadle model and the 2010 come with the sliding hook on the flyer. I see by researching a bit that Ashford came out with a larger capacity flyer/bobbin set up also.
Single treadles are slightly lower (about $595 new) that includes the wheel, 3 bobbins & orifice hook. With a bag, $685.
Double treadles are going for $655 without a bag and $745 with bag.
I see on an Ashford group
where a late 1990's Joy (with bag & 3 bobbins) sold for $400 last month.
A 2009 Joy with regular flyer + 5 bobbins and larger flyer + 4 bobbins has a price of $500 (with bag).
2 months ago a Joy was offered "with bag & bobbins) for $300.
2 months ago 2010 Joy with bag & 4 bobbins sold for $650