I just posted this for someone else, here is a write up on the rear drum to disc conversion parts list

Rear Disc Brake Conversion Parts List

These are all OEM Honda Part numbers, that means take them to any Honda dearlership and they can order the parts for you. Most dealerships will not have the parts in stock, you will have to order them. I have also included a general list of what else is needed for the conversion.

Trailing Arms Complete : Used from 92-00 Civic, 94-01 Integra, 93-97 delSol, or 90-93 Integra (these work fine but the bushings are bigger) . Try to get them as complete as possible, at the very least you need the arms, hubs, calipers. Any missing parts can be used from your existing setup. Just about all Civic/delSol/Integra rear disc brakes are identical, so use whatever is available. Check on eBay.com / Salvage Yards / or order from www.passwordjdm.com (about $200)

Right Cable - 47520-SR2-933
Left Cable - 47521-SR2-933
Pins (2 needed) - 43471-SD2-930
Pin Snap (2 needed) - 90705-SD2-931
Pads w/ Shims - 43022-SR2-010
Rotors (2 needed) - 42510-SR3-000
Right Hose - 01466-SR3-903
Left Hose - 01468-SR3-902

You will also need things like brake cleaner, fluid, etc. you can get those at any parts store.

To save some money you can get your parts from local places like AutoZone / AdvanceAuto etc. It is usually cheaper to get the pads and rotors unless you insist on have OEM Honda ones. Another option is upgrading to aftermarket pads/rotors/lines, just make sure to order them for the donar car with rear discs.