I would like to practice my card counting skills online, but I have not been able to find an online blackjack casino or game where I can do so. Many online blackjack games claim to be double/single deck etc, but in fact the cards are just randomly generated each hand making it pointless to count.

Is there any online games/casinos that offers a true single or double deck blackjack where the cards actually come from a simulated deck and are not just randomly generated, having at least 80% penetration before reshuffle?