Oops.
Sorry, I never use renown to buy anything myself, so I couldn't say off the top of my head and didn't think to look it up.
These two posts from the same thread will tell you how to:
A) Change the renown cost for each boat.
http://www.subsim.com/radioroom/show...58&postcount=8
B) Just give yourself so much renown you can buy anything any time you want.
http://www.subsim.com/radioroom/show...67&postcount=9