Scan Gauge Group Buy question

I submitted an order for the Scan Gauge group buy
1. using the BUY HERE link, typed in my information,
2. used the link to Paypal, but the price was 159 instead of 149,
3. return to PriusChat stopped with a 404 Page Not Found error.

Now I have a $159 payment receipt at paypal but my messages to Danny using the PM in the group buy note and email to [email protected] (found in the paypal payment details) have gone unanswered.

1. Should I cancel my paypal payment?
2. Is there someone else to contact?
3. Are there any Scan Gauge IIs in stock, to have it in time for Christmas?

Thanks in advance.