I received this "kankun smart plugs"

http://www.ebay.com/itm/WiFi-Cell-Phone-Wireless-Remote-Control-Switch-Timer-Smart-Power-Socket-Plug-New-/391226154561?hash=item5b16e55e41:g:npEAAOSwgQ9Vzrct

you can find it on aliexpress to.

At $15 US dollars each, is a good price
with the help of this guide:

http://benlo.com/esp8266/KankunSmartPlug.html

I can control the switched with a SCRAPE on voxcommando

and with a raspberry pi and this guide:

http://benlo.com/esp8266/KankunSmartPlug.html

I can control the outlets with the amazon echo

so now, I can control an outlet with voxcommando, with amazon echo, with a cell phone, with a web browser on a pc. all this with 15 us dollars

My recommendation is to order more than one, because the shipping from china takes about 3 weeks. And
be sure to order the right form factor of your outlets ( I get the ones with the asian plug, so I have to order the adapters).

Do these outlets rotate ports like the Belkin WeMo's do?

Looks like he's using a simple scrape of an http url so there are no ports involved. 
http://192.168.10.253/cgi-bin/relay.cgi?on
Assuming you can set these up with a static IP address I don't think you'd have any problems like with the Wemo.

Thanks, I haven't had time to read all the documentation mexicanto shared yet, but I diffidently will now 

Hi Peg,
James is totally right, you controlled with the scrape function
as far as i know, there is no port to configure (the default is 80)
and in some part of the instructions, they provide the way to assign an static ip
this devices is UPnP, i can control it over internet from other part of the town
Is exactly like wemo, but 30 dollars cheaper.
hope this can help you.