On the subject of consumer electronics …
How low can it go? The price of PCs, that is. The cheapest desktop PC I was able to find online was selling for less than US$300. That's pretty cheap, but remember the era of FreePC and PeoplePC (now an ISP)?
These and several other start-ups in the first round of the Internet offered free (ad-supported) PCs to consumers. The consensus was that the concept was flawed. (I had a friend who ran such a start-up and I almost worked for him.)
Regardless, if it doesn't get to free it will get close. Deflation (or something akin to it) is happening in the PC market.