After a rotten 2008, this year got off to a really bad start — so bad that even the most optimistic housing analyst in Las Vegas is extremely concerned. Sales of new and existing homes tumbled in January and foreclosures rose from December, according to statistics released by SalesTraq. The median price of existing homes sold in January tumbled another $10,000, dropping the price to $150,000. That’s a 48 percent drop from the highest price for existing homes at $288,000 in February 2007.