Where can I find a large assortment of outdoor acrylic paint?

I have an idea for a birdhouse that I want to make and decorate and I want to put it outside. My only problem is that I can’t find all the colors i want to use in the outdoor paint at Wal-mart and Michael’s. I haven’t checked Hobby Lobby yet though, so I don’t know if they have more variety or not in colors. Does anyone know where I can find some more colors? I want to use a cream color, light blue, light green and dark brown. I thought about just mixing white, brown and yellow to get a cream color.. but does anyone have any suggestions?
P.s: I also need sparrow stencils.

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