Ikea rip off items!!!!

Hi i used to work for ikea and regulary buy ikea items off ebay, all of which i have been pleased with. However when searching for ikea items i always come across small ikea items such as carrier bags and bath matts. People advertise these items for sale for say 3.99 and they are only 50P!!!! in your local store. I have been seeing a lot of the massive blue ikea carrier bags advertised for buy it now 2.99!!!! They are 25P!!!! in store also the seller had to cheek to charge 1.80 postage, i just cant believe people do this.