Where to sell 78RPM records?

I recently inherited a handful of 78RPM records. The collection is composed of opera, classical, and Broadway music on Columbia, RCA, and Decca labels. They are boxed sets consisting of 4-10 records in remarkable (for their age) condition; my father was very OCD.
I'm looking to find a good home for them. Anybody know where these could be sold? No Ebay.

Thanks in advance for any assistance.