One piece? Good luck.
Menards has panels made of 3/4" pine. They're not plywood, but
individual strips glued together. Strong and fairly lightweight. 10',
though, might be a special order.
Most of us would either make them ourselves, or try to find a piece of
plywood to fit. It really depends on your intended use.
Wise is the man who attempts to answer his question before asking it.
To email me directly, send a message to puckdropper (at) fastmail.fm
If pine grows in your part of the world, look for sawyers in your
or the online equivalent. Also hardwood lumber outlets (not lumber
yards per se
or home centers often carry very wide boards, including softwoods.
Google is your friend
Internet sites which have White Pine or SYP
Steve Wall Lumber (10 " or width and up to 16 feet)
Groff & Groff (have up to 22" width)
There probably lots of others, but, since I don't want pine, I quite
looking after these two places.
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