Call and ask. Such items are priced on supply and demand. Price changes as stock is too plentiful or availability is limited.
Lots of money if you have to ask.
You didn't specify enough details, but a 16' Ground Contact AC2® CedarTone Premium Pressure Treated Decking Board is $15.99 each, and a 16' Above Ground AC2® Green Pressure Treated #1 Thick Deck Board is $15.79 each. There are other board types and lengths available, too.
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