Here are some of the best free sources for comparing residential lumber grades and getting a sense of contractor/retail pricing:

1. APA – The Engineered Wood Association

Best for: grade definitions, structural properties, panel/lumber selection

• Website: apawood.org
• Offers free guides on:
  • plywood/OSB grades
  • span ratings
  • structural panels
  • recommended uses for residential construction
• Great if you want to compare what the grades actually mean, not just prices.

2. USDA Forest Products Laboratory / Forest Products Library

Best for: technical grade standards and species info

• Website: fpl.fs.usda.gov
• Free publications on:
  • lumber grading
  • wood species characteristics
  • moisture content, strength, defects
  • reference manuals like the Wood Handbook
• More technical, but very reliable.

3. WWPA, WCLIB, and similar lumber grading agencies

Best for: grading rules and grade stamps

• WWPA: Western Wood Products Association
• WCLIB: West Coast Lumber Inspection Bureau
• They publish free materials explaining:
  • framing grades
  • appearance grades
  • allowable defects
  • how grade stamps work
• Helpful if you’re comparing 2x framing lumber or board grades.

4. Home Depot / Lowe’s / Menards / local big-box websites

Best for: retail price benchmarking

• Search online store listings for:
  • 2x4, 2x6, studs, treated lumber, plywood, OSB, decking boards
• Compare:
  • price per board
  • price per linear foot
  • price per square foot for sheet goods
• These are not contractor prices, but they’re a useful baseline.

5. Local lumberyard websites and online quote tools

Best for: more realistic contractor-style pricing

• Many lumberyards publish:
  • live pricing
  • contractor account pricing sometimes visible with login
  • delivery charges
• Even when prices aren’t public, some sites allow “request a quote” forms that will give you a real market number.

6. Building product marketplaces and estimate sites

Best for: rough cost comparison

• Examples:
  • Build.com
  • GoBec-style supplier sites
  • Some regional supplier portals
• Good for comparing several product types, though pricing can be inconsistent.

7. BLS and government price indexes

Best for: market trend context

• Bureau of Labor Statistics (BLS) data on building material inflation
• Producer Price Index (PPI) for softwood lumber and related products
• Good for understanding whether prices are high or low relative to historical averages.

8. Random Lengths and trading/market reports

Best for: wholesale lumber market pricing

• Mostly not fully free, but some headline reports or summaries are publicly accessible
• Useful if you want to know what contractors and suppliers are reacting to in the broader market

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Best free combination to use

If you want the most practical workflow:

1. Use APA / USDA / WWPA to understand grade differences
2. Use big-box stores to see retail baseline prices
3. Use local lumberyards to compare contractor-oriented quotes
4. Check BLS/PPI if you want to know whether prices are moving up or down

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Quick tip for comparing prices correctly

When comparing lumber, always normalize by:

• board foot for rough lumber
• linear foot for dimensional lumber
• square foot for plywood/OSB/sheet goods

And check:

• species
• grade
• moisture content
• treatment
• region
• delivery fees

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If you want, I can also give you a free spreadsheet template for comparing lumber grades and pricing side by side.