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G-AMP 20+RMC-XLR+RCXFB10B. Rockville G-AMP 20 Watt Guitar Amplifier Combo Amp Bluetooth/Delay + Microphone. $249.99 $86.95. VIEW DETAILS. Quick view Compare Add to Cart. G-AMP 10. Rockville G-AMP 10 Watt Guitar Amplifier Amp With Bluetooth + Clean/Distortion. $99.99 $49.95. VIEW DETAILS.