In an email recently leaked to TechCrunch, HP employees were told they will get exclusive access to the additional stock:
After a thorough review of options, I'm pleased to share that starting at 9:00am (Pacific Time) on Wednesday, September 28th, HP employees in the United States will have one last chance to buy an HP TouchPad through the Employee Purchase Program on a first come first serve basis. Pricing will remain the same as it has been during the wind down process -- $99.99 for the 16GB TouchPad, $149.99 for the 32GB TouchPad...while limited supplies last.
Even for people who might not be interested in owning the tablet, those prices leave plenty of room for profit reselling them. The 16GB model, in particular, is selling for twice or more its original $99.99 price on eBay.
Although WebOS, the native operating system for the TouchPad, appears to be on life support, discount TouchPads have resulted in extensive interest in running Android on it. In particular, the developers of CyanogenMod appear close to a fully functional release for the TouchPad.