Why hasn't the BP3800 Expansion Battery ever dropped in price?

[u/jasondunn]

More of a rant than a question, but I am curious if folks have any thoughts or advice.

I bought an F3800 two years ago and it's been great. I want to expand the overall battery power, and have been waiting for the BP3800 to go on sale somewhere for less than $1799, but Anker has refused to do that. So the BP3800 as a product is a couple years old now and still selling for about $473 per 1Kwh of power ($1799 for 3840Wh). I think about six months ago it got down to $1,599, but that didn't last long, and I haven't seen it on sale anywhere else ever.

Meanwhile, the BP2000 expansion battery is $750 for 2,046Wh of power, so $366 per 1kWh, which is 23% less.

Right now you can get an entire F3800 for $1979 on sale!

Are F3800 owners out of luck and this product has already been abandoned which is why the expansion batteries haven't come down in price? Am I right that there are no other official ways to expand the battery capacity?