Adorama discounts a selection of Polk Signature speakers, as listed below. Plus, all orders receive free shipping. Each is at least $10 under our mention from last month and at the lowest total price we could find by at least $90. The deals:

• 2 Polk Audio Signature Series S10 2-Way Compact Satellite Speakers for $109.99 (low by $90)
• 2 Polk Audio Signature Series S15 2-Way Compact Bookshelf Speakers for $139.99 (low by $90)
• Polk Audio Signature Series S30 2-Way Center Speaker for $139.99 (low by $90)
• 2 Polk Audio Signature Series S20 2-Way Bookshelf Speakers for $184.99 (pictured, low by $115)
• 2 Polk Audio Signature Series S50 Small 2-Way Tower Speakers for $274.99 (low by $225)
• 2 Polk Audio Signature Series S55 Medium 2-Way Tower Speakers for $369.99 (low by $290)