I have the 1983 - 1984 edition which I got for a song in 1992 or thereabouts. Basically the pricing is obsolete unless you are working in a time warp, but the product information is still relevant.
Another thing to remember is that the US dollar was worth quite a bit more only a short time ago, the drop in the dollar will possibly have more of an effect than most people realise.
I actually have that Ivor Matanle book that HKR gave a link to, interesting book which I picked up on a whim at a secondhand bookshop for a quite low price.
The bottom line is that you would probably be better off staying with what you have and using your own judgement as to what a camera will probably sell for from a seller who isn't under duress to sell at any price.
I thought the electronic auction houses were what gave a more reliable and up to date selling price, for almost anything!