I bought a second hand fuel pump and relay on ebay a year ago for £35 and it's been just fine.. They pop up on ebay from time to time, plus you may want to email anyone who is breaking a CBR to see if they have one available.
If your fuel pump is bust you could always run it gravity fed until you find another one. I did that for a couple of weeks waiting for mine to arrive, and my bike was fine. If you connect the fuel tank straight to the carbs the hoses are just long enough
If you do, you just have to remember to turn the fuel off when you park the bike up and try to keep the fuel tank as full as possible..