BUY ONE
Company: MicroEngineering Labs, Inc.: 719-520-5323
Model: PAK-VIIIa Pulse Output Coprocessor: $24.95
Description: Pulse Width Modulation coprocessor
Est. Total: $31

ORDER TWO OF THE SAME
http://www.acroname.com/robotics/parts/R133-MD03.html
Company: Acroname: 720-564-0373 (not sure if can order by phone) 
Model: R133-MD03: $103
Description: Medium Powered H-bridge
Est. Total: $216

BUY ONE OF EACH
Company: IFIRobotics.com: 903-454-1978
--Model: IFI-V883 with a 36 inch pwm cable: $148
Description: Victor 883 Speed Controller
--Model: 36" CABLE-PWM: $5
Description: 36" PWM Extension Cable
--Model: PWM-SIGNAL DRIVER: $10 (<- $10 when buy it with the 
Description: PWM adapter
Est Total: $178

BUY ONE OF EACH
Company: Parallax: 888-512-1024
--Model: BASIC Stamp 2p 40-Pin Module: $99.00
Description: Microcomputer
--Model: BASIC Stamp 1 Module: $34
Description: microcomputer
Est. Total: $145

BUY TWO OF THE SAME
Company: Fun Time Inflatable Products: (305) 289-4660 
Model: "Endura 30" Transom Mount: $129
Description: Trolling motors, 30lb thrust, 30AMP max, 12VOLT
Est Total: $280

BUY TWO OF THE SAME
Company: CyberMarine.com: 1800-597-1781
Model: "Rule 14a" 3700gph bilge pump: $106.55 
Description: 12v 24ft deep bilge pump
Est Total: $230

BUY ONE
Company: RobotStoreHK: (+852) 9752-0677 (in hong kong)
Model: "Vector 2x" electronic compass: $89
Description: electronic compass
Est Total: $110

BUY ONE
Company: Decade Engineering: (503) 743-3194
Model: "BOB-3" Video OSD / On Screen Display Module: 99.95
Description: Video Overwrite Module
Est Total: $106

------------------------------Total--------------------------------
EST. Total of everything combined: $1,296.00
$740 without the bilge pumps, or bilge pump h-bridges, or compass
if add $700 for TCM2-20 = $1,440
then would still need a third motor (+$98) and two more h-bridges (+$360) and pressure transducer ($100)= $1998