Value-conscious geeks are snapping up the last available units of Palm’s Pre and Pixi smartphones at huge discounts as the company moves across to new owner, HP. And at these prices Palm’s smartphones really do look smart. Take the flagship device, the Palm Pre Plus. Verizon Wireless is offering the 16GB, 3G-savvy touchscreen handset for just $29 with a two-year contract. Or, for the same price, you can get the Palm Pixi Plus, with Verizon offering a “buy one, get one free” deal for both models of phone. Verizon no longer charges for its Palm Mobile Hotspot service on either phone, so you can tether…