As it turns out, he also has automata available in two other galleries at this time: the Heike Pickett Gallery in Kentucky and the Logsdon 1909 Gallery in Chicago, Il. A few of the pieces shown on their sites may have sold, but many are available.
Shown here is a piece entitled Gatekeeper. I love the box/platform. Just beautiful.
Here is Steve Armstrong's work at the Heike Pickett Gallery. Here is Steve Armstrong's work at the Logsdon 1909 Gallery (Flash required).