There have been plenty of hints that Hewlett-Packard’s TouchPad isn’t selling well. First there was a $50 discount. Then there werespot discounts of $100 at outlets like Costco. Then the $100 discount became permanent. Adding insult to apparent injury, a deal on Woot for $120 off an entry-level 16-GB TouchPad netted all of 612 takers...According to one source who’s seen internal HP reports, Best Buy has taken delivery of 270,000 TouchPads and has so far managed to sell only 25,000, or less than 10 percent of the units in its inventory.