They will manufacture more tablets hopefully at the $100 (or $150) price point. I am sure some are already manufactured and should be heading to the US shortly as sea shipment takes several weeks. Also, it's in HP's best interest to manufacture more at the moment for several reasons including:
1) components have already been purchased and instead of writing down inventory (at its partnered manufacturers), they might as well manufacture and get some revenue
2) The company is keeping the webOS software, and while the company is still trying to figure out what to do with it (license or sell), having more TouchPads out there can only help keep the developer community interested at a minimum. They need the developer community to stay active if the company were to attempt to monetize the asset (they will at best get only half of the $1.2 billion they spent on it, just a guess).
I want one myself as it couldn't hurt to have a tablet like that at such a low price. I'd keep checking the website rather than rely on the company's e-mail distribution list.
Best of luck trying to find the second best selling tablet (though at firesale prices) in the market
Nabil