FTD stands for Follow That Dream records - a small part of the BMG empire - which only issues Elvis Presley releases in quantities believed to be less than 10,000. Made available through mail order.
The FTD releases are those deemed to have no general over the counter sales appeal, although this is subject to debate.
For the official rationale and company profile go to the EPE site :-
http://www.elvis.com
And start collecting!