color scheme

I am working on a Boeing 737-300 kit in 1/144 and was wondering if
anyone knew of a decal set for a Southwest scheme...old or new.

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Jet Decals make what you are looking for, including some of the special schemes. They are available here in the US:

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or here in Europe:

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They also sell the paints you will need, Xtracolour brand, made by Hannants.
There are other places, but these come immediately to mind.