Factory new ones cost about 180 each - are rubber - and will still perish - getting second hand ones in good conditiopn is near impossible
My money would be on calling whiteline suspension - or go thru a suspension specialist like pedders or fulcrum - they have adjustable camber strut top's for about $350 a set ( CHEAP!!) all solid - and you get the benifits of being to dial in camber more effectively ..