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If you're buying a new one the description will usually tell you if it's regulated. If it doesn't say anything, it's usually not. I was going to post a link to a site with some that are and some that aren't when I cam across this adapter with the perfect description: http://www.allelectronics.com/make-a-store/item/dctx-936/9vdc-300ma-wall-transformer/1.html
"A Note on Wall Transformers: A.C. and D.C. Wall Transformers are not regulated unless otherwise stated. They provide a specified voltage at a specified load. If the load is lower than specified, the voltage will be higher then specified. With a higher load, the voltage will drop below that specified. For example, a 12 volt 500 ma. wall transformer may read 20 volts with no load or 9 Volts with a 600 ma. load."
That sums it up pretty well.
