The above prices do not include shipping. Packing and shipping original art is pretty expensive, but I don't charge the full amount that it costs me. (I probably should but I don't. Currently.) I like to hand deliver orders within central Oklahoma if possible, as it saves both parties some shipping costs.
Here are the shipping rates I charge for paintings shipped within the US:
4"x6" and 8"x10"=$15
9"x12" through 12"x16"=$24
If I'm shipping more than one painting to the same address, the cost will vary according to the size of box they will end up fitting in.