I am now accepting sketch pre-orders for Summit City Comiccon in Fort Wayne Indiana, May 22, and Heroes Con, in Charlotte, NC, June 4-6. If you're going to either con, you can email me with a pre-order, which I will have finished and available to pick up at my table. I will be doing sketches at the con as well, but this helps me keep up with the demand I often receive and the sketches typically turn out better when I do them at home.
Examples of all of these can be found here.
Pre-pay via PayPal to avoid carrying so much cash at the con. Just send me an email at firstname.lastname@example.org Space is limited, so sign up early!