Connect secondaries in parallel and you have 12v up to 1A, put it on one side and use plastic electric cable ties or some other method to attach it to pcb.
RadioShack sells 12V Transformers, they are expensive, but convenient if you need it quick. They sell a 1.2A 12V one for approx 10-15$ It's labeled 6.3-0-6.3 because it produces 12.6V with the two outer wires. They are not very large.
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