an extension that picks prices form back-end and add to front-end
I've been suggested by Linnlive for this extension. their message is:
"Alternative way of having different prices on magento is to install an extension for this. Linnlive will send prices of child items to magento back-end. Afterwards, extension will pick these prices and add them to your listing front-end. Regarding extension please connect magento support for more information. "