Hello,
I have the 1/100 Robotech factory (Revell), which includes 1/100 Tomahawk. Also have 1/100 Phalanx (Imai) and 1/100 Spartan (Arii). In 1/72 I have Tomahawk (Arii), Defender (Imai), and Spartan (Imai). Regarding an earlier post, I have the 1/100 Arii Battlepods (large missle, small missle, and scout), the 1/72 Imai Regult (standard battlepod), and 1/72 Arii officer's battlepod.
Let me know what you think and what you're willing to pay. Keep in mind that most of these have not been issued in quite some time and are collectible (except the Bandai re-issues, as others have pointed out).
--- Andrew