Firstly it kind of depends where you are. I mill timber and do tree surgery so have some idea of value, but it seems that timber in cornwall makes better money than elsewhere, eg devon, as we are lacking in trees down here, hence have to buy a lot in. As a rule of thumb though, i would pay about 50p per cubic foot for hardwoods at the roadside, and about £3.50 for a cubic foot delivered in. The seller ends up with the same as the transport usually makes up the difference. This seems to be the going rate with the three or four bigger mills in cornwall that i deal with also. If the timber needs any extraction then i would not expect to pay anything for it though. The way timber is measured is by the "Hoppus foot", which has been around since 1730's and is still used today. The equation to work it out is as follows. " Mid quarter girth divided by four, then square it, then times by the length of log in feet, then divide that by 144" Therefore to work out the volume of your log you measure the circumference at the halfway point- in your case it must be ABOUT 75 inches, divide that by 4= 18.75. square that= 352. 352 times the length is 7040. divided by 144 = 48. Therefore you have 48 cubic feet in that log. there are various yards on line that will advise on prices, but usually only for sawn stuff, but most will help you out if you call them. Or you could just fone your local sawmill- its not in their interest to mislead you, viz-a-viz future business opportunities- but ring around. Timber in the round is not worth much. Had you thought about having a mobile mill in. Most will charge from 280 upward for a day, and one log is far from a days work, and you will have some beautiful and valuable timber at the end of it- green sawn oak beams can go for around £30/cubic foot depending on quality! Hope this essay helps not bores you!! Good luck- please dont cut it into logs tho'!!!