Ancho chili powder is the go-to chili powder for authentic Mexican cooking. It's commonly available and distributed by McCormick, among other brands. Look for it where all the other spices are at the grocery store.
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If you don't want to buy or can't find ancho chili powder, substitute regular chili powder and a little crushed red pepper. Ancho chili powder is not very spicy, so you don't need much crushed red pepper to match the heat.
For a recipe that calls for 1 teaspoon ancho chili powder, substitute 1 teaspoon regular chili powder and 1/8-1/4 teaspoon crushed red pepper.