I've found that for first quality American White oak, a price tag of around £25+vat a cubic foot is about right (don't forget that most commercial suppliers sell hardwood by the cubic meter or foot, and not running meter). Lavers tend to be the cheepest if you have one neer you.
A/W Oak tends to be very uniform in figure, with little character. If you want something with a bit more about it (eg small patches of knots, and figured grain) try English or French oak. The price per cube is about the same as A/W, but English and french oak mis normally sold in waney edged boards, meaning you can be looking at 50% wastage, as opposed to 10-15% for square edged boards (the way most A/W is supplied)
Just one other thing. When you buy softwoods they tend to come in standard set sizes, e.g 6 x 1, and are sold by the running meter, but hardwoods come in either waney-edged boards, sorted by thickness, and sold by thickness and total volume, or in square edged boards, sorted by thickness and random widths seperated into brackets e.g 4" and up or 9" and up and sold by thickness, bracketed width, and total volume. :?
clear as mud????????????
Hope this helps
Doughnut