I wonder why that model in particular. It seems odd they are specifying a model rather than a set of specifications. For all intents and purposes this disqualifies any manufacturer other than Mil or those selling used Mi-17's, or maybe be manufactured under license from Mil (HAL?).
I'm not arguing the fact that it's a good, dependable, sturdy, cheap helo, but there are likely others that can also do the required job.
Slider... <sniff, sniff>... you stink.