If the Endicia portion is true - the cost will offset anything gained by the cost of ink. I have used Endicia for a couple of years, they are great and it is fantastic to have their services however they also do not get the USPS discount that you get when shipping through eBay. So a package shipped from the States to Canada costs me about $0.60 more - adds up quick.
I was in Costco last week - they were marketing a $200 HP printer/scanner pretty hard when I was in there - the guy said that it uses less than 10% of the ink of rest of the printers on the market. That would certainly pay for itself pretty quickly if true.
Have been meaning to go back and check it all out when I don't have the kids in tow but haven't made it yet.