Today the 550 is on sale for $199 at Walmart.... More on reddit.com

Check out rtings.com you can see the breakdown of their review and you can also compare different ones side by side. It was really informative and helpful for me when I was looking to buy a new one recently. More on reddit.com

To start with, you have speakers there that are replacements for other speakers. Firstly the Solo series (and the TV speaker series) are not considered soundbars. THey won't give you movie quality or surround sound. They are really just there to improve on your TV sound (particularly vocals) without blowing the budget. They lack many functions like adding surround sound, and generally have no app or wifi connectivity. I beleive the 15 replaced the 10, and the 5 replaced the 15. The "Bose TV speaker", replaced the Solo naming conventions and is the current on. The current Soundbars are the 600 (entry level, but just announced the replacement "Bose Smart Soundbar") and the 900 (top of the line) are the current ones. So if you are after movies and good quality sound, you really have a choice between the two (better or best). Bose tends to sell through old stock fairly well, so if you are seeing those others, it's likely they are second hand or refurbished. More on reddit.com

I don’t believe there is duty on consumer electronics, they could make you pay GST on $300 but very unlikely. Declare it and see what happens. More on reddit.com