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by bi-facial I assume you mean the ones that can absorb light on the shady side? they are basically a gimic, the best way to get the most power from pv is to point it at the sun and get the most light on it, so unless you are reflecting light at the back side of your panels, then it's not worth the extra cost, and if you can reflect light at the back side, then turn them around and reflect twice as much light at that side! you if you keep them cool enough you can double their output when you double the light hitting the serfice.
The estamet chart gives a price range of $8 to $17 per watt for an installed system, this price will of course be dependent on where you are, how much shade you get, how easy it is to install the system, if your system is going to have batteries or be grid inter tie without batteries, if you have a tracker or a fixed mount, and it's the kind of thing that you often save money and have it work best if someone who is familer with solar design your system and tell you where to put it, people making poorly informed choices is how renewable energy got a bad name in the '70's, please learn from our past.
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