The IGT Poker games are not that difficult to find. You basically buy a cabinet with 044 hardware on it and you buy a flash board for each type of poker game you want. I suggest you look at the casinos and see what the name of the multi-poker game sets you want and look for them that way. I know that Ultimate X Poker is included in the Superstars Poker board. It also inlcudes Super Times Pay Poker, Spin Poker, Tripley Play Poker, 5 Play Poker, and 10 play poker. Blackjack, keno and full versions of the slot game Coyote Moon and Wolf Run. It is by far the best poker board out there. A machine with that software runs somewhere between $1,300 to $1,700 I would say with an LCD monitor. In Texas you should be able to find dealers all over the place with these machines. The Hot Roll poker, I think is only avalable in the AVP platform, although I'm not entirely sure about that.
As far as the Aristocrat games are concerned, they are going to cost a LOT. They are relatively new cabinets and the casino's are not letting them go. They will typically replace the software on them a couple of times before the machines are sent out to auction. So I would say at least 2 or 3 years before you see them available in the secondary market, but be prepared to pay $5K + for them when and if they become available.