1. Adapter - Yes, they are cheap (less then $10) and can be purchased at most electronics stores. For Continental Europe (most of it anyway, definitely Spain and France), something like this is what you need:
http://www.futureshop.ca/en-CA/product/ ... 5a4cfeen02
For the record, the UK actually has a different plug.
2. Converter - Absolutely not. They are heavy, expensive and most importantly, completely unnecessary. Virtually all modern electronic devices like cell phones, camera batteries and such are dual-voltage. I can guarantee the iPhone is, spent seven weeks in Europe last summer.