Re: National Pricing catalog
Most suppliers do not print the prices in a catalog. Prices are volatile and always changing.
Graybar has a catalog that includes some prices. Use the prices to compile a job bid, and you will never get any work.
I've been away from estimating for a long time. I always used the "Biddle Book" for pricing. The prices are constantly updated.
Of course the only way for accuracy, is to get confirmed price quotes from the seller.