| USA | The Mad Professor Royal Blue Overdrive delivers smooth, dynamic drive th... | $130.00 | |
| Japan | Overdrive with a wide range of tones The Royal Blue Overdrive (RBO) is a... | $219.97 | |
| USA | Designed by Bjorn who still designs for many companies. He took the Tube... | $175.00 | |
| USA | Need a new stomp box? Of course you do. This one sounds amazing, is very... | $139.00 | |
| USA | Here we have for sale this used Mad Professor Royal Blue Overdrive.... | $119.99 | |
| Japan | Welcome to Qsic's Reverb Shop!1. The description texts have been generat... | $162.07 | |
| USA | Used excellent condition. Has Velcro on the bottom.
