I’ve been poking around with a similar set of cheap outlets - specifically the Westinghouse Command1 that was sold in Target for $10 for a 3-outlet pack.
Most of the cheap stuff is circa 315mhz or 433mhz - it’s possible, at least if the device is sold in the US as well, to find this from the FCC ID. If you’re ok with opening up one of the remotes, you can generally find the resonator being used (which is a dead giveaway - the HR433A clearly shown on my little remote points me to http://www.datasheetdir.com/HR433.92A+Resonator which shows, quite nicely, 433.920MHz.) I’ve found that all of the semiconductors are epoxied…
Modulation is much more difficult to establish…preliminary looks seem to indicate everything cheap is ASK.
I’ve got a couple RF transceiver kits on order - one 315mhz, one 433mhz - from seeedstudio. If you’re buying gear in AUS though you might have better luck with dx.com (they have a warehouse in Australia.) No documentation but super cheap - $5 buys you a paired receiver (adjustable frequency via trim pot) and transmitter (fixed frequency.)
My plan for the short term is to solder a set of transistors to emulate the soft switches on the remote - not the most elegant solution - and then control it using an Electric Imp ($30 SD card sized package with WiFi, pair to a $12 breakout board to drive it with USB or battery power) - I assume that if I can get it to the point where there’s a set of discrete URIs it’ll be possible to integrate with SmartThings.
The big downside with my approach is that the outlet won’t communicate anything at all back - not even basic on/off - I think the correct thing to hack will be the Iris Smart Outlets. They’re $30, appear to run on ZigBee (I’ll be doing a teardown if I can find one in stock tonight) and claim to support both on/off and power monitoring. In the meantime I’ll probably just send the requested command several times.
Learning RF remotes exist…kind of…it’s more that systems like Pronto have recorded a huge number of instructions and codes. These systems are strictly one-way affairs…and I’m starting to realize how limiting that really is.