If at first you don’t succeed, keep reducing the price until something sticks. HP is reducing the price of the 16GB HP TouchPad to $399 – $100 off the original price.

This comes after HP’s move to reduce the price $50 a few days ago. These swift price changes are pretty odd, to be sure, and if things go any lower I’d suspect HP was telegraphing slow sales.

That said, it could be a nice way to play with a WebOS device for not much dosh. The deal will appear on HP’s website this weekend and run until August 7. Staples is also offering a weekend discount of $100 on both devices if you wanted to grab that instead.