The price of plywood has been steadily rising for the past few years. Before I retired I worked for an export packing company that used plywood by the truck load.. and sometimes if we could get a deal, by the rail car load.. it actually became cheaper for us to import our plywood from Brazil than to buy locally, even though it was probably the same wood being brokered... I brought in about 80 container loads (40' containers) over the last 18 months I was working. Our plant was 4 blocks from the Georgia Pacific distribution center, but still bought from Brazil.
We used regular CDX plywood, not OSB.
I'll age myself, but I had my own company with a couple of partners a few years back (mid 80's) and we were complaining about buying plywood at $6 a sheet.
Also saw a news blurb on yahoo about illegal logging... People are actually stealing whole trees off other people's property.. one woman lost over $50,000 worth of oak off her property. States are starting to react to this by passing new laws against the practice.. it's gotta be tough to steal a whole tree.