You could buy another prelude, like my 5th gen. otherwise you need to go to a wrecker and get all of these parts:
5speed manual transmission with mount
5speed ECU (you can convert your auto ECU to manual)
Release (throw out) bearing
Pressure Plate Bolts
Slave Cylinder with hard-line
Master Cylinder with hard-line, clutch dampener and clutch fluid reservoir
5speed Intermediate (half) Shaft (you can re-use your auto axles)
Transmission Fluid and Brake fluid for the clutch. DOT3 or DOT4
5speed shift knob and boot
5speed Gauge Cluster (some people reuse their auto cluster)
Link to convert your auto ECU to manual: http://honda-tech.com/showthread.php?t=1275452
You can ask Roy (username on here is exrwagon) to convert it for you, he did mine for somewhere between 10-20 bucks
Or you will have to get your new manual transmission ECU reprogrammed to work with your car by Honda IF you have the red key to your car. If you don't then you have to get a locksmith to reprogram your immobilizer which costs somewhere starting at 150 if not more (this is just a guess I don't know the actually costs)
If you buy a new 5speed ECU you will have to go to Honda and get it programmed to work with your car. This costs starting around $150-$200. Once again I don't know the actual cost, this is just a guess.
Also make sure you or whoever is doing the conversion for you to put a spacer between the clutch and firewall or else your clutch won't fully engage and it will slip. Place the spacer(s) between the clutch master cylinder and firewall with 1/4 inch washers.
Pics of what I used:http://i189.photobucket.com/albums/z125 ... pacer2.jpg
Adjust the clutch master cylinder rod as well and ensure there is a gap between the cruise control switch rubber piece thing and the pedal arm.
This had to be done so the rod is fully extended out. Also mount the clutch pedal bracket to the top of the car through the firewall, behind/underneath the windshield wiper motor. Mark a hole, drill through, place a long bolt, washer and nut and tighten it up, solid as a rock!
I recommend reading this write up from preludepower.com: http://www.preludepower.com/forums/show ... p?t=302157