Hello again Steve - glad to hear you may have found a Quiet Line. As for suggestions to find a deck, well, once you're pretty certain about having the tractor I'd post another thread on here for the deck and sub-frame. Fortunately the deck (44A/50A) and sub-frame for it were used on the later wide frame (1x8/9 series) and the Quiet Line series so you should have a bigger population to draw from.
One thing that may be going for you is that many of the members like having several tractors and dedicating them to specific uses. In doing so they may have a spare mowing deck they don't use. Now, is that mowing deck gonna be in good condition? That probably depends on your meaning of good condition. It gets kinda costly to refurb a deck with pulleys and/or spindles, but if you're open to paying for that stuff (if the deck needs it) you may find a member willing to do it.
Maybe some of the other members will chime in with suggestions as well.