You can always buy the TOMI downloads
for $4.95 now and order the DVD later if you need to combine it with something else to save on shipping (you're going to have to make up your mind fast, however, as tomorrow morning is also when the Great Adventure Bundle sale ends - unless it gets another extension, which is not too likely).
You should only have to pay $15 plus shipping for the Deluxe Edition once you own the season.
However, don't wait too long to order it as Telltale's own Jake believes that the Deluxe Edition are "leftovers" from the original pressing (see post #12 of this thread
) and no other pressing is scheduled at this time.