Len, there are 3 authorised dealers here on OZCT that offer good cards. First you have Digeze, then redtorana and lastly goldcoastcards. These 3 gents are all high quality dealers and you can't go wrong shopping with any of them.
Of course you can also buy and/or trade with all the members who frequent the NRL forum pages. Keep your eye out for Case Shares, in these shares you put your hand up for a box or two at the sellers price (usually below eBay prices) and all members of the share have a chance to hit the big redemption in the case.
Dave