I looked into one last year and I believe Carlos at Ed's Gun Shop was the cheapest. Plus you can throw a can or two of BH209 on your order and not have to pay the hazmat.
As for ignition I would order the bare 209 ignition unless you think you'll hunt somewhere that requires the western set up. In that case I would buy it as a western set up and then buy the bare 209 conversion.
For a scope mount I would buy the DNZ. Never used one buy heard great things about it for the cost.