Regular $99.99; $6.95 shipping. Serif has released WebPlus X6, and put X5 on sale. You can download for the same price, but the physical shipment includes the WebPlus X5 Resource Guide book and a bonus CD, High Impact eMail5 Platinum.
WebPlus X4 has been posted at deals.woot before, but never X5 (at least in my search).
Note: if you have purchased from serif.com before, check your email for a link to a bigger discount. It populates the page with your info, so I can't hardly share it here (unless someone wants to buy this for me!).