HP is offering up a $50 rebate to owners of a Palm Pre or Pixi in a clear attempt to get some early support for the TouchPad. The offer is good through the end of July and all you need to do is prove somehow that you own one of the phones although the exact process of proving your loyalty isn’t clear just yet. The big caveat here is that the offer is only good on the $599 32GB TouchPad rather than on the more affordable 16GB $499 model. But hey, $50 will cover the cost of a nice case should you choose to enlist with HP. [Palm Blog via Engadget]