First, how far is the range of a typical module/homebase?
Second, someone had told me the "poll"-able two-way modules were no longer produced/manufactured.. Is that true? I saw they were available on x10.com...
What are you calling "homebase". TM751? RR501? CM15A? The CM15A has the poorest range.
X10 range is very limited. Without antenna modifications, unobstructed range is maybe 50 feet. Less if going through walls. There are plans on this forum for modifying the CM15A receive antenna and adding passive radiators and "blow gun" antenna mods to the xxxEye style motion sensors, but even with these mods I think 150 ft would be pushing it.
X10 has not made 2-way modules in 5-6 years. Where did you see them on X10.com?
Smarthome.com does have X10 protocol modules which transmits back status changes.