I've seen the KS ships go for anywhere between $29 and $80 each, and generally speaking, the prices have risen over the past two months. I have no idea if the prices will continue going up, level off, or go back down. It really depends on the future success of Sails of Glory as a whole. If the game continues to sell well, and the pool of active players continues to increase, then you can expect the prices to keep rising.

As this particular moment in the US, if you see KS Ships of the Line for under $50 a piece, I'd say buy it right away. Maybe $40 for the frigates? Anything more than that, and it's really a matter of just how badly you want them.

But I would ask - how much do you really need them? For that kind of money, you can buy all 12 Wave 2 ships for less than the four KS Exclusive ships, and Wave 2 will give you a whole lot more variety to choose from.