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Valve springs normally last the life of the car or engine - 500-750kmi. The valves can last that long too, but check them while the head is apart. They're expensive so you don't replace them unless it's necessary.
A new head comes bare with no valves, springs, lifters - only the guides and seats. At the dealer it iwll be over $2000 for a new head. Best price online is about $1600 that I know of. Most salvage yards want $800-$1200 for a used one. The yard in NY has one for $500 per my other post. Make sure it's not cracked, as shown in my other photos... that's how most of them fail in the first place!
Good luck,
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