Digitaltruth has contacted me which was quick. It is claiming that it has several failed orders tonight due to Paypal server problems. I cannot quite see how a Paypal server problem results in the Digitaltruth site showing OUT OF STOCK but be that as it may. The reply says that the stock is very low so assuming this not to be "salespeak" then anyone wanting to take advantage of the offer might want to buy very soon and if it is correct about the Paypal issues then using a credit card might be wise.