All Acura car models have their paint codes in the driver side door. The color codes can contain numbers, letters and dashes.
For a diagram showing you exactly where Acura paint codes are located, with an example of what they look like:
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Acura Touch Up Paint
There are two primary suppliers of Acura touch up paint online. First is MicroFinish. The second is PaintScratch. Both use exact match original OEM colors for their paint. MicroFinish has more colors, but both companies provide good paint.
To compare prices we went through the ordering process for a Black 2008 Acura Csx. A 1/2 ounce paint bottle was $5 less at MicroFinish. A 2 ounce bottle $4 less, and a quart almost $40 less.