In poptropica Skullduggery Island how much do the ships cost and where do you get them?

There are six larger ships available for sale at Dragon Cove. They have a range of costs, and a new ship will allow you to earn more doubloons to buy even larger ones. It does not take as long as you think.

Their cost in doubloons is

3000 --- Jimmy Rigger (1 cannon)

9000 --- Carabelle (1 cannon)

30000 -- Sea Sultan (2 cannon)

90000 -- The Koi (3 cannon)

300000 - Steaming Fury (4 cannon)

1,000,000 doubloons (for the largest ship, the Phoenix Warbird).

BEST WAYS TO EARN DOUBLOONS:

1) pick up salvage items (around Dragon Cove and Golden Harbor)

2) sink pirate ships and sea monsters (very risky but lucrative)

3) trade wisely(buy cargo where cheap, sell where expensive)

(see the related question)