Oh that's crazy far, but I found this locally:
21 broadbills 7 old squaws 12 buffleheads all have long cords and 2lb lead anchors for deep water
longisland.craigslist.org
I would exhaust local shows, garage sales, let go and Craigs List before investing in long drives and big money. I've seen a lot of adequate paint jobs on refurbished decoys that are all over the place. If you feel that you like it, then you can dump off your gear on the next guy coming up and parlay that one into a finer rig. And I have found that you really don't need as many as people will have you believe.