I was in the General Store last month, and I asked if you could still get a post card with the SDC postmark. The lady behind the counter told me that the USPS shut down their post office last fall. I hated to hear that. That was one of those little things that made SDC so unique.
On a semi-related note, one of my childhood favorites was always the "party line" phone in the General Store. How exactly does that work? It must be pretty primitive technology, because it has been there for years. However, the audio is crystal clear. Anybody got any insider information on how that phone works?