Rustic Bench

You can even check Depot Lowes / Home. Ask the clerk of the section of wood, if someone has the tools at home to do so. Sometimes they have hobbies and extreme might be able to help. Or they might know someone who can.
Also, check crafts fairs for woodworkers. These seats are sold at such shows like that. One of the craftsmen might be willing to cut the wood for you for a fee.

Why do not you do yourself?

Post and posting on www.craigslist.org

someone with a sawmill where I do but in the heart of rural areas, there are many ppl with them

Try the local office of the Forestry Commission, or a tree surgeon

service tree local contact.