gonna need a gas tank

I am gonna need a gas tank for this 73 Dart Sport. I have to decide whether to go used or new. If anyone has a GOOD,USED RUST FREE INSIDE tank that is complete with the unit and all, please let me know a price. the outside as long as it can be cleaned not an issue. this has to be rust free on the inside. prefer to have on that has been ran recently. see what is out there and I will decide whether to go new or used. Thanks,Bill