The current (amps) specification is usually a minimum, in this case 700mA. The 1200mA figure is a recommendation based on the fact that it's generally a good idea not to run a PSU right on its limit (in much the same way that it's not a great idea to run your car engine at the red line revs all the time!).
The important thing to bear in mind is that (simplistically) while PSUs 'push out' volts, it is the device connected to them that 'pulls out' the amps. This means that the device will only 'pull out' what it needs and no more. This, in turn, means that after meeting the minimum (or recommended) current (amps) specification it doesn't actually matter how much current the PSU is capable of providing.
Thus, in this case, a 2 amp or a 5 amp (or more) PSU would be perfectly ok to use. Of course, higher capacity PSUs will cost more and likely be much larger, but those are different considerations.
My point is that it's not necessary to find a PSU that exactly matches the specified figures. Voltage, yes, that MUST be correct as specified, but the current specification can always be regarded as a minimum. This approach will generally make it far easier to find alternative PSUs.