A quick check on eBay shows several LPE-200s for $350US or so, but it must be ProVoice enabled (Option 29). One of them is. So it might be had for $400-$500CDN. That would still leave the programming. There are other EDACS radios e.g. Orion which are ProVoice capable. I am not the expert on this.
There is also the matter of encryption. Etrunk, last I heard, does not give correct indication of which TGs are encrypted but I imagine some are. Regular dispatch is probably not. There is no legit way around this.
Anyway, I'm not set against someone doing this (monitoring without compromising the system ) I just don't see how it can be done above-board.
Lastly, if I had a Provoice-capable receiver I wouldn't want it to be public knowledge, if only that the criminal element would find these devices a useful tool in their trade and looking for sources.
Dave