not 100% but thing they were in the range of about £250, so around $450...alhtough that is a guess, so not a cheap option. Will have a look around for more definate prices, they do some funny deal that you have to go through a store to get them, dont sell them direct, but think it also depends on weither u want them to adjuste it too(as in Gel inserts, raising/lowering extending length of main seat, shortening main seat etc..going to investigate though and see what sort of deals i can get.