Funnier if it were true: Guy King, the founder of RetailMeNot, a site which lists online coupons for discounts on e-commerce sites, is mocking the effort to rescue Wall Street with a 25-percent-off offer when taxpayers spend $700 billion or more. Seriously, though: Getting 25 percent off the price at which the banks want to offload their mortgage-backed securities on the government sounds like a great deal — as long as it doesn't wreck their balance sheets further.