I took a quick look on Beneteau's spare parts
site. It's about $530, but that's for everything... the chrome Beneteau logo ($50/set), the "BENETEAU 423" logo ($40/set), the logo inline with the stripe at the bow ($100/set), the "B" on the stern ($90), and the two green stripes (1/4" $100, 7/8" $85), and the silver stripe (1/2" $70).
The stripes are just green and silver vinyl stripe tape. They are commonly available online. The logos could be made by a boat name person of you can find the image online for them to work from.
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