wheres the best/cheapest place to taste out some of this jamon iberico pork
Your best deal is to go out and buy it yourself. Ideally they will slice it in front of you off the whole leg. Whole Foods typically stocks more in prosciutto, but they may have some Iberico. You won't get anything good at regular chains, even if the pre-sliced packages say "Iberico" I'd probably pass.
I think your best bet in Vegas is here:
2275 E SUNSET RD, LAS VEGAS, NV 89119
OPEN MONDAY - SATURDAY 9 AM - 5 PM
702 436 4252
They have Iberico De Bellota by Fermin, which is probably the best you're going to get outside of Spain and NYC. I know Jose Andres (e/Jaleo/China Poblano) uses Fermin as their supplier, can't speak for Robuchon.
If you go to a restaurant looking to try it, I would suggest Jaleo (where e is) They have a flight of three types, ranging from Serrano < Iberico < Iberico de Bellota. Cost: $38 It won't be much food, but you'll get to try all a decent range of them, and its definitely authentic.
Jaleo @ The Cosmopolitan
Off-topic, but If you happen to be in NYC for whatever reason, they hand slice this good stuff at:
408 Broome Street
NY, NY 10013
When I went about a year ago, they were the first one to bring a different brand than Fermin. Cinco Jotas (5J) Super expensive, but they'll let you order just a few slices. And both the Fermin and the 5J from there was delicious.
To ensure that you are trying the real thing, you will need to rely on those that are willing to put their reputation behind it - Julian Serrano and Jose Andres being at the forefront for that particular product. But it will not come cheaply from them. You can get "Jamon Iberico de bellota" from Andres' outpost at Jaleo (Cosmopolitan), which runs $24 for an appetizer portion. And at Serrano's property at the Aria, "Pata Negra" is $38. But while the best of the best is sublime, some of the "lesser" grades are awfully good, and can come in at reasonable price points.