How many "slips" or whatever you are using vs how many you have, and the link to buy more.
The only way I've found to access this page is by actually building a ship to sell and trying to sell it. Sucks when you can't remember how many spots you have, and then if you're full you have the ship you just built out there dangling in the breeze.
Also, I understand the reasoning behind not allowing pulling ships off the market, but maybe you could allow upgrading your own ships while they're up for sale? It would allow getting stalemated ships that won't sell for even 1 cred off the market.