I'd be willing to mix and match the parts but it depends on how much I buy of each thing. I don't want to end up with 10 spare IFUs laying around but I could easily sell Core Grafx systems separately.
Depending on the condition of the components I would say a full CDROM2/IFU/Core Grafx set up with system card 3.0, cables, adapter, and a controller would run in the $150 to $200 range depending on the condition. If the parts are a little scratched or yellowed it would be closer to $150, but if everything is clean and white and perfect I'd say it would be closer to $200. If you don't need the Core Grafx/PCE, system card, cable/adapter, controllers, etc, could knock the price down accordingly.
Again I'm still kind of feeling things out with this one and I'm not sure how much shipping will end up costing me, but I'd like to offer this at a reasonable price to you guys.