Newegg.com has the TP04 in iron/blue for 389.99 (retails for 549.99) + free shipping. Sold directly from Dyson on their Newegg account. The white one was available too, but it looks like they changed the description on that one to refurbished.
I've been in a market for a fan and purifier combo and have heard nothing but great things about this item. Lowest price I've seen. If anyone owns one or has feedback, would be great to hear it!