My answer to your question is no, I don't have a specific place where you will definitely be able to locate a shower pan.
However, there are several RV salvage yards and checking with them may be fruitful. One that comes to mind is Colaw's
https://colawrvsalvage.com/ They've helped us in the past with used parts. Keep in mind the stock changes regularly so you have to stay in touch with them.
You didn't say if your shower pan is completely missing or perhaps just has a few cracks. If cracked... it can be repaired. I've heard of people using fiberglass to reinforce the cracked area on the underside of the pan and then recoating the interior with a spray-on substance that gives the pan a new life. If yours is cracked, do some searching on Air Forums as well as a broader Internet search to find more information on ideas for repair.
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