If you are interested in purchasing any of my work, the easiest way is for you to send me an email. Tell me what you are looking for and if I don't already have one, I can probably make one for you. I accept checks, Visa and Mastercard, money orders, and PayPal. And, yes, I can ship it to you.
Framed originals, greeting cards, and small matted originals are available on Etsy.
If you're looking for fine art reproductions, then either Fine Art America or Society6 are great places: