Yes, give them a call. I payed 375 for mine with the coax mod when I had mine...about 6 months ago now
Also, I STRONGLY reccomend the pre upgrade. I found the pre's in the ua-5, without mod, to be utter crap if you wanted to push the gain. They are probably fine for loud rock shows, but if you plan on taping anything quiet at all, the pre's are not up to the task. Consider both mods.
Daryan