It is my opinion that if you are a professional carpenter, you should own both a corded and a cordless oscillation tool. The corded for when you need to do a lot of work, and a cordless for quick cuts and when you need to move around a lot. Unfortunately we cannot all afford to spend $300 to get both tools. Today only, Amazon has the cordless Dremel Multi-Max for only $73, and that is for a New kit. The kit includes a couple blades and a sanding pad to get you started, and also comes with two 12 volt batteries and a charger. Yesterday's price for the same tool was $89.91.
Dremel Cordless Multi-Max - Amazon
