UK store Andertons have the Mark V on their online store now. Their price is £2,249 for the head, £2399 for the 1x12.
http://www.andertons.co.uk/Electric-Guitar-Amps/pid15440/cid557/Mesa-Boogie-Mark-V-Medium-Head.asp
There have also been pretty major price increase for 2009 on Mesa/Boogies this year in the UK market. You can use google cache to compare, but for example, Andertons price on a Roadster head has gone from £1999 -> £2199. Thats a 10% increase.
http://209.85.229.132/search?q=cache:u5kDJZVUJLkJ:www.andertons.co.uk/acatalog/info_2RS3XB.html+mesa+boogie+roadster&hl=en&ct=clnk&cd=5&gl=uk
http://www.andertons.co.uk/Electric-Guitar-Amps/pid10356/cid557/Mesa+Boogie+Roadster+Head.asp