Does Invulerability potions are avaible in city shops (I know that in RtL they can't be played anyway). But in AoD rule book there is no price for Invulerability potions. Do you now that those potions can be purchase from shops like all other potions??

Yes, you certainly can buy invulnerability potions from the town shop.

Thanks. But do you know what is price of this potions?? 50 coins as usually??

Yes, that's correct. All 5 potions cost the same, 50 coins.

Thanks for quick answer. I will add potions to shop now Greetings.

Yes they are 50 coins at the town shop as they clarify this on pg. 7 of the Tomb of Ice expansion.