Finishing
I use Cabot brand stain. It's a good quality stain and I have had great results from the Australian Timber Oil series. They also have a great on-line color visualizer:
http://www.cabotstain.com/visualizer/exterior-color.html

Exterior stain finishing prices:

Love Seat - $45
Adult Chairs - $30
Children's chairs, side tables and foot rests - $15

*Specialty stain combinations may cost more based on finishing methods.