Redline-ci.com in California. They hooked me up for a LOT cheaper than some of the prices I've seen on this site.
i have sucessfully smeered them with sikaflex to fix them if you take your time ans rub it into the cracks first they end up looking brand new. i would try this first as its practically a free fix... make sure you clean them real well first. gl sobil
if there just rock hard but not cracked apparently you can microwave the in hot water for couple minutes which softens them temporarily so you can have time to install them.