Just so you know, the artbooks on ebay are all located in Japan so you'll have to pay a premium on shipping.
And that $145 price on the RSR book is a stretch, but not really that big of a joke. That artbook is skyrocketting due to the increasing popularity of Cala. Everybody wants it. I saw them sell for $70 this time last year, and one went for $95 a few months ago. Even on Yahoo Japan they're fetching 6000-7000 yen (thats about 65-75 bucks)