Keith, if you send it out to K&G, it will average out to about $5 per block of wood, pretty consitently.
Walt's right IF you have over 10 lbs of wood. They charge $10 per pound finished weight of the wood. If you're under 5 lbs, it's $14 per pound finished and 5-10 lbs is $12 per pound finished. It makes sense to do it over 10 lbs. if you can.
You can figure that the wood will double in weight, also a good consistent average to base numbers on. If you weight up 6 lbs of wood, to be safe, you can figure that will go over the 10 lbs of finished weight for $10 per pound.
If you only have a few blocks you want to try...you could send them to me and I'll send them in with a big batch I'm sending in soon. I'd throw them in with mine and you could have them done for free. Just an offer. The wood will need to be dry to stabilize.
Just shoot me a PM or email if you want to go that route.