The site isn't actually selling anything as such as far as I can tell, apart from the adverts/links to amazon.
Its providing information regarding this particular cartridges compatibility with a range of disc printers, and the obvious repackaging of cartridges by large companies to make more money from consumers.
I'm in the disc printing market/industry and the cost of consumables such as these ink cartridges is one of our biggest ongoing expenses, especially when companies make them only usable in 1-2 printers the price suddenly goes up.
edit: link removed.