Google a few places such as Ashridge Nurseries and check not only their prices, but also provenance ie where they source their plants, and delivery costs
to your postcode. There is one obvious place but I won't recommend it as their way of conducting business offended me greatly. There are lots of fish in the sea so you'll find somewhere near you. Another thing to check is when they will deliver to you as from another nursery our plants arrived almost too late into the spring to get them planted one year.
We are now very happy with Cheviot Trees in Northumberland but they are not local to you and only provide module grown stock, but excellent service and quality of plants.
It has taken 25 years for us to have just about completed all the planting we can fit in and still have room for livestock, so maybe you should do perhaps half of what you intend this year, unless you have lots of willing planting volunteers