Just got another email on this. In one place it says:
"As quick note keep in mind you will need to have a brokerage account other than TDameritrade to buy SNPK. If you are still with TDameritrade you should close your account right now and open one with a good company like Etrade or Schwab."
I purchased Thursday through TDA. Anyone know if they're now disallowing further purchases? I just added more funds to my account which will be cleared for trading Monday....