Just a couple of comments as the topic has been covered well. Carry your nitrox card to wherever you want to acquire a nitrox filled tank-0 your own, or one on a liveaboard or other dive boat or shop away from home. second, I am a firm believer that you nitrox tanks should be clearly marked so no one presumes they are air. with EAN32 it's less of a safety issue than with a 36 or higher, but it's best to have the tank clearly marked as a nitrox tank, especially if it will be riding or sitting among other tanks that are not nitrox.
A note on tank fills. I do a lot of it, and the fact is that if the shop has a lot to fill, they get filled a little fast, and then they cool and are not "full." So we always "top off" tanks before they go out as rentals or to an open water dive training weekend. If you bring in you own tank, and want a fill while you wait, in an AL 80 we can get it real close to 3000 or even 3000 plus if you are not in a hurry. If you leave it for an hour or more, we'll have it maxed every time.
DivemasterDennis