[EDIT: but, yes - as ID states above, these should be included...]
Don't forget, there's different levels of "Advanced Maintenance", that allow you to repair a ship's integrity or repair the paint but not always buy limpets.
Course, it's very likely that Carriers will supply limpets... although that kind of begs the question of how buying them will work.
I mean, it's your Carrier so will you have to purchase limpets supplied on your own ship?
Are we to assume there's a man aboard your Carrier who can provide an infinite supply of limpets and is happy to travel all around the galaxy with you?
Anyway, my only real point was that people had better be careful they've got all they need to refuel/repair and maintain a Carrier before they take it for a long journey or there'll be tears.