Some options you may want to consider are:
DSA-3100 - can be had for about $550 CDN (need to hurry coz it's discontinued)
or
this.
I was considering the latter but I don;t have enough time but enough complexity in my networks, and that would have to be reworked.
As for what you responded to JP, sure, they can get cheaper service but still, adding a line about "free" inernet access in your classifieds might be a good thing from a business perspective. All depends on how many tennats you have.