Knownothing, did you notice the post by Jdoris suggesting Johnboos.com? That's the same board sold at Williams-Sonoma here in Dallas. A friend bought a 2" thick 18X24 for about $80.00. That compares favorably with many other brands not nearly as well made as Boos.
The ones at Target are about a half inch thinner than Boos and sell for $69.95. Sure, they have some at $14.95 too but they are paper thin.
You are wrong to assume because I suggested W&S that they have only overpriced goods. Re-read my post, I suggested Jimmymac call before driving.
If you want the very best deal on butcher block I can give you the name, it's McMaster Carr. Be prepared to buy in LARGE quantity. I bought 6 or 8 commercial food grade maple table tops, 2.25" thick by 72 X 36 (3600 pound capacity) and had a cabinet shop custom cut all of them for my equipment.
However, not everyone needs that much material and that's the purpose of these forums, to make suggestions that might help the other person.