[USER=14900]@Red Buffalo[/USER] The portable printers are an older variety and use the legacy 802.11b network protocol since it's what they're compatible with. They are most likely not bluetooth or ad-hoc compatible. The MyDevices could do bluetooth, but I don't think they would do AdHoc WiFi very well since IOS devices can only associate with one Wireless device at a time.
Target would need newer models to do what you're talking about. Honestly I liked the printers Target had -- they were reliable and very easy for me to setup/troubleshoot.