My recommendation would be to a) get a 12 VDC wallwart (or transformer as you call them), b) make sure it has atleast 1 A capabilities, c) wire them with a cheap rhiostat knob/voltage splitter and d) wire them in parallel. This will let you run them at full if you want but you can turn them down if they are too noisy, make sure they both run at the same speed (the voltage drop across the first will casue the second fan to run a bit slower and also you won't explode your wallwart because you are over drawing it (0.24A x 2 = 0.48A... more than your unit is rated for. And yes, I realize that is 0.24A at 12VDC).
Head on out to your friendly local electronics supply store and they'll help you out with finding the right part.
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