I needn't have worried so. When Joy went to the market, she found two 200 watt step-down transformers. Now we have a DS. Now we have a working VCR/DVD player that plays our stuff. Now we have a working baby monitor we can plug in in both rooms. Now we can charge our US phone and get our friends' phone numbers. Now we can wish we had kept the original Wii cord, because the replacement we got still doesn't work. Well, I guess we can replace it next year. But everything else is just fine. We can get all the transformers we want for 13 bucks. There was no need to have gotten even one, let alone two, $60 transformers, plus shipping.
But that's why we have this blog, to let future travelers beware.