Dunno. Before the PUP change recently where it became standard, it made perfect sense for them to not do these sales. My guess with their thinking was that if you wanted that part (and consequently the HEPA filter), you paid for the PUP-grade.
As for now though, not sure. I guess things are still the same. Those that don't have the PUP got the $$ discount when they passed it up. Does Tesla even offer an after-sale PUP-grade anymore? (I'm too lazy at the moment to search to answer this myself.).
Just went through this myself. No, they won't install the firmware update that adds the "Bioweapon" button. The button is purely cosmetic and just blips the fan to 9 for a few seconds to cause positive pressure in the cabin... but they won't enable it on non-PUP cars.
Cost was the same for me. I just asked for the filter, without mentioning the BW this time and they sold it no problem. Definitely ask by part number and you shouldn't have an issue... that $260 was with install, so I didn't even have to mess with it. Was glad to pay the extra to not have to tear apart the front, even as easy as it is.
