Wait, an item to get me Teleport for 8k? Awesome. Tshern man, you've just enabled a Planeshift vacation to Arborea to actually be plausible. Since I know the artificer we buy from is high enough level to make rings at least. Even if 3/4 of us are probably going to suffer Chaos / Good sickness there, I don't care I still want to visit.
Double carrying capacity and Teleport in exchange of any fifth level or higher spell slot. Page 204 in MIC. It is rather neat, no denying that. Nice to know it helped someone.
You could always use Planar tolerance (4th level to Clerics, Druids and Rangers, 5th for Sorc/Wiz), Attune form (3rd level for Clerics and Druids, 4th for Sorc/Wiz) or Avoid planar effects (2nd level for Druids and Cleric, 3rd for Sorc/Wiz) from SpC. The last one of the three has a nasty duration of 1min/CL, but the others have at least 1h/CL. If you have a friendly Artificer, Planar tolerance actually has a duration of 1h/CL, affects creatures in a 20ft burst (1/CL maximum), but it can be accessed as a second level spell from the Elysium domain. That ought to help with travel sickness.