They may technically be blue chips, but that doesn't necessarily make them your best bets at their discounted prices.A good stock is an even better buy at a low price. It doesn't necessarily follow, however, that all discounted stocks are great investments. After all, the company in question must first be worth owning at any price.This truism presents something of a conundrum for investors right now. Several blue chip stocks found in the Dow Jones Industrial Average (^DJI 0.81%) tumbled last month even thou ...