Very interesting - I won an A3000 service manual from them in April 2006. The paypal was in the name of G&G Publishing Enterprises (orders@centsible.com). They were very good about communication, confirming receipt of the payment and advising me of the shipment. And it arrived priority mail the same week in great shape. They also responded to later inquiries of mine regarding a 4000 service manual (there is no such thing, I was told).
Keep us informed for future reference. If they've suddenly gone south I'd be wary.
-David