<p>Having worked with Integrity for many years, I can say that your best bet are newer 'old' avionics (aka prolly not on ebay), automotive systems (prolly on ebay) and newer medical equipment (no idea). </p>
<p>The other thing to note is that Integrity is one of the few RTOSs that was certified by NSA, and it's fundamental build system generates heavily isolated/segmented images. Best bet is to find a device that has network interface since those services (ftp, Web, telnet, etc) are provided out-of-the-box and not typically certified. Also, besides very basic inter process comm, most services run in isolated user space processes. </p>
<p>Have fun! </p>