Glad you like'em Paul... have just zoomed in on that 'Devil Girl From Mars' and it looks like $1000 (the three US stalls had their wares marked up in $'s), does that sound in the ballpark? The "Queen From Outer Space' had $650 on it... not sure whether they're good or bad prices!
Weirdly enough I actually picked up a flyer for the Camden event today, the dates listed are 14 April, 26 May, 18 Aug, 20 Oct and 8 Dec (all Saturdays). I'll try and take a photo of the flyer and post it on here tomorrow (together with the rest of the Westminster dates as they've got some great celebrity signings coming up this year).