Hi Loki,
It is unfortunate that some resellers don't always have their site up to date.
A while back it has been communicated to the resellers and on the website that Ultimaker has discontinued the Ultimaker Original and all upgrades for it. Parts that are UMO only should be still available for the next 5 years or so.
As for the upgrades, this stock has been distributed over all the resellers. As soon as they are all out that's the end of the story. Non can be ordered anymore since the product pack now no longer exists. I hope iGo has one for you!