Then one is 13V and the other is 12V.
Are you saying that when not joined they are "12V" each ?
I note the specs are different.
I guess I should just find 12V PSU that is actually deliver 12V and not 13.7V
If that's important.
Maybe with a load the voltage will drop a bit.
Switchers can be like that (some minimum load required).
Best would be a 4-way power supply that is designed to do it.
Also acceptable would be two identical 12VDC power supplies, but a lot of those wall boxes are junk. I'd get something nicer.
Less ideal, but since it's for powering a fairly balanced device, you could probably get away with splitting a 24VDC power supply with a semi-self-balancing circuit.
If you really are looking for the "best" option for a +/-12V PSU, a dual output bench supply purchased from a reputable supplier (ie not Amazon or eBay) would be the answer. It would not be cheap, but it would serve you well for many years.
However, it appears that you're actually looking for "what's the cheapest route I can go and still get away with it for one particular application". Which is an entirely different matter.
Adafruit sells a +/-12V adapter which may serve your specific need. Unless of course there are other requirements you haven't mentioned that would rule it out.
I was going thru my box of wall warts a few days ago. One rated at 12 VDC at 1 Amp shows 18 VDC with no load. My project was very lightly loaded, so I didn't use that one.
Add some 'wall warts', especially the oldies, have only a transformer, a bridge rectifier and an electrolytic capacitor (ripple smoothing).
On junking day, get one of the hundreds of 80286 desktops out of the trash and remove the probably-good power supply. Stable +/-5vdc and +/-12vdc.
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