Thumb Score: +17 Adorama.com has PreSonus Ceres C3.5BT Two-Way Powered Bluetooth Studio Monitor Speakers for $100 - $10 Rebate = $90. Shipping is free. Thanks Corwin Deal Editor's Notes & Price Research: Good price on these highly rated Bluetooth speakers with 4.4/5 stars based on 57 Amazon reviews. Our research indicates that the PreSonus Ceres C3.5BT Two-Way Powered Bluetooth Studio Monitor Speakers is $110 lower (55% savings) than the next best available price from a reputable merchant with prices starting from $200.