If contemplating a major purchase, remember to take your passport along to the shop and get the purchase duty/tax free. I found that most shops in Tokyo, especially electronics or tourist related, will do it for you if you are purchasing over $100 in items. A camera would definitely qualify for that.
They will staple a page in your passport that you need to present along with the item at the airport when you leave, but unlike some countries your purchase will not be sealed in a special bag preventing your usage in the meantime.
Your manual will likely be in Japanese, but so many of them are downloadable these days that it doesn't really matter much. I was personally amazed at the price of Canon supplies in Tokyo as compared to Australia or even the USA - ink for my printer was $9, vs $17 in the US and $25 here. If you are targeting camera equipment, make sure you visit a place like Yodobashi Camera. The hardware prices may not be the cheapest you will find, but the selection is amazing.
Eric
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