Roubaix SL8 seatpost options?

Was just in a local shop and saw a Roubaix SL8 Sport at a nice discount. It comes with a proprietary D-shaped seatpost with a 20mm offset. I probably need a zero-offset for a good fit. The only one I see on the Specialized website is the $275 S-works version: S-Works Pavé SL Carbon Seatpost

Is that really the only option?

I was happy to see exposed cables. Not happy to be blindsided by a unobtanium seatpost.

Is the bike in a Specialized shop? I recently bought a Roubaix in a Specialized shop and they changed the seatpost free of charge for me.

Theoretically, anything that is compatible with the D-Shaped SL6 seatpost will work with your SL8 Roubaix. This will help expand your horizon.