NOTE: I am not attempting to sell any items here I am just asking for help with a price check

I'm thinking of selling a few things and one of them is a Roland MPU-IPC-T ISA 8bit card I even have the matching break out box........then hold your breath I have an Mt32 that's been modded by one of the original two guys when they were doing them back in the day for a separate clean and reverb output (I use a mixer to get great results), this is where I need your help I see MT32's go for about $500 to $600 on eBay but all of them are non modded units I cant find any MPU-IPC-T ISA cards to give myself a ball park figure of what they are worth, I know these cards are getting rare and harder to find so please help me because I'm looking to sell them on Facebook so I can get my learners on my dirt bike.