Music Theatre of Wichita has a LARGE drop inventory, if they have a show that had these, don't know if they do, they could ship them to you. (I am a previous employee)
Otherwise, there are plenty of drop warehouses out there, I believe Hudson has a drop inventory as well as Chicago Scenic.
For a less-commercial solution, get on the phone and start calling local university and college Scenic Designers from which to rent, borrow, or barter.
Good that you're starting early, as the drops you mentioned are likely used in every holiday production, which I suspect may make borrowing difficult.
We also rent drops. I believe that there are contact phone numbers on our website. I have no idea what the rates are or shipping costs, so I would suggest calling. We have a fairly extensive collection of drops, all painted in house.