Maybe I got lucky with mine, I didn't pay that much!
There were lots of 384KB cards on the market, I'm just fond of that particular model because it adds serial, parallel, and a real time clock (which uses a coin battery that doesn't leak all over the place) and it's fairly easy to find. Those prices are a bit high though
But anyway, I might actually have one spare, I'll know for sure by the end of the week. I'll send a PM.