I purchased a new spectra tank for an a body just a few months ago. I got it from 521 restorations. Dealt with Jeff Brown. Great guy and the lowest price anywhere and I'm located in Canada. The tank was $119 plus $35 to ship from Colorado to Niagara falls New York. Couldn't get anywhere for less. I believe he is a member here on moparts. I was referred by the membership also.
Good luck