holey rock is by far my favorite rock to put in freshwater tanks. there is a site where u can get like 15 lbs of it for 20 bucks... ill see if i can find it for ya
also look it up on ebay
texas holey rock... theres some great pieces on there for fairly cheap... pieces that would cost me like 80 bucks (2.99 per lb at my store i get it) i see nicer pieces on ebay same weight for half the price