Male or female?
100% hypo that's for sure. Salmon is a line bred form of hypo. It's hard to say whether it is or not because many people use "salmon" as the word hypo. It's is most definitely a nice looking hypo boa though, very deep reds and oranges. And it appears to have some good size. If it's female I would pay $250. Male I would pay $150. I haven't kept up on prices lately though. I do know hatchlings go for $100 ish.
Now as far as it being an argentine, it wouldn't be pure. It could be a cross, but I don't see that whatsoever