Home Slickdeals monoprice.com discount codes. $125/off $500+, $35/off $150+, $6/off $25+. Good through 4/29.... Slickdeals monoprice.com discount codes. $125/off $500+, $35/off $150+, $6/off $25+. Good through 4/29. Monolith THX Select 10″ sub for $375 By ARCOM - 30 April 2019 153 0 SHARE Facebook Twitter Go to the deal page: monoprice.com discount codes. $125/off $500+, $35/off $150+, $6/off $25+. Good through 4/29. Monolith THX Select 10″ sub for $375