+1 for Telescopes Canada.
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Also, First Light Optics (FLO) in the UK. Note that all their prices include local taxes. When you add an item to cart, and change your address to Canada, the price changes to pre-tax. You have to pay typical Canadian taxes when it arrives in country.
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FLO is not always worth the extra hassle, but they have unbeatable prices on some items, particularly Baader products.