Was there any prototyping or usability testing done locally before now and can you contact/get access to those people?
(Ideally, this should be an ongoing part of the development process over time & you'll have a list of interested early adopters. If not this time then for the next one! :)).
If not, can you get to anybody at all who fits the target demographic (& can legally see the thing)?
Try to get "out of the office" if at all possible - take it to a local [place where target users are] and let people play with it (if doing so won't get you fired). If you can't take the real thing, maybe a mockup or stand-in that won't give away the game but can be used to answer the same questions?
Surveys are ok, but again you need an audience. Although self-selecting at least it's free feedback that's easy collect/analyze online. Can be hard to write good questions though & mouse/pencil-whipping is a risk.
Employee testing can be better than nothing, if they're not familiar w/the product & don't have habits or knowledge a typical user wouldn't. Don't want to reinforce biases or assumptions, but if that's really all you have go for it.
Last thought: Do you have access to any potential users in the distributor's areas? Would be a good opportunity to gauge local feedback/demand as well (again, probably should've been part of the process before now). Are the distributors going to do any usability testing on their end w/data you could get access to?
Use Skype/Google+ (or a phone call? Crazy talk...) to schedule & conduct sessions at a distance, screen capture if possible with the user talking out loud to at least hear them say what's confusing, broken, or awesome. If not real time, ask them to record short videos. Similar to what you'd do in person, just without the same opportunity for immediate follow-up.