Yowtch! I didn't think the Weir/DeFillipis volumes were going for more than cover, but yeah...cheapest I'm seeing for the "X-Posed" collection on Amazon is $25 used. There's one in new condition for $22 plus shipping on eBay. You could also just get the single issue instead since Northstar doesn't feature heavily in the series aside from a couple of cameos and that one story. Issue #13 about $2 on eBay. Or get it digitally for the same price off Comixology and save yourself the shipping.