There's a Flatiron pancake mandola- I know, not arch top but should be a great instrument- on Reverb:
https://reverb.com/item/43863235-fla...bozeman-w-case
Needs a little bit of repair but you could probably get him down under 1K.
There's a very beat up old Gibson mandola on Reverb for much less but it needs more repair. Just go to Reverb.com and put in "mandola" and see what comes up- mostly Eastmans but there are others too.
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