I hear goals of 100-150$/kwh (not retail) as being already reached by Tesla and Chinese automakers. However the cheapest retail LiFePO4 build for energy storage

I hear goals of 100-150$/kwh (not retail) as being already reached by Tesla and Chinese automakers. However the cheapest retail LiFePO4 build for energy storage (done by individuals after importing the lifepo4 cells from China and assembling all the items) is barely touching 300$/kwh. I suspect there is a demand supply mismatch with demand far outstripping supply and not enough overproduction for retail discounts.