Amazon offers the Bose Acoustimass 6 Series 5.1-Channel Speaker System, model no. 29275, for $369 with free shipping. (Sam's Club charges the same for its members.) That's tied with our March mention as the lowest total price we've seen. (It's a current price low by $330.) This system includes an Acoustimass module with 5" woofer and five cube speakers.
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