Stickman,
I'm not totally familiar with Old Britts but from what I can tell, they are a reputable supplier of Norton and other British motorcycle parts.
So what I'm saying in a round about way is that there is no cheap alternative source of Norton motorcycle parts. In general, Norton parts can be purchased quite reasonably compared to other makes. However, if you feel you are way over budget on your restoration project you have two choices:
1) Sell your bike now to me cheap and cut your loses; your wife will thank you for months to come.
2) Be patient. Break your project down into small financially manageable tasks. This solution works great if you have the will power. Don't scrimp on the frame coating or engine over haul. These items form the foundation of your re-build.
Raber's in San Jose, California might be closer to you than Old Britts so you might save some money on shipping if you buy parts from them.
Other than that, all I can say is that riding a good running Norton is an intoxicating experience and worth every penny you put into it.
HTH (hope that helps) Deb, take note of the abreviation.
Jason