I like Woodland Scenics line of model railroad products. The Standing Timber is realistic looking, but like most of Woodland's trees that are made of plastic or rubber the color is not natural. I like to lightly spray paint the trunks a light gray to tone them down even followed by a coat of DullCote. When you look at trees in nature their trunks are a lighter color.
I would go for even or even offer $50 for the group.
Happy tree planting.
Greg