Off the top of my head (read: extreme ballpark figures):
A dedicated DWDM box with cards for eight lamda is ~US$125,000.00 per box, you need identically configured boxes for each end. I believe it comes rigged for diverse paths, but may be more or less, depending on the type of inputs (DS3, OC3, OC12, OC48, GigE, etc).
I think the Extreme WDM blade is US$ ~60,000.00 - $80,000.00 each, you need one at each end.
Exterior-grade direct burial (gopher rated) or "figure eight" (aerial) multistrand (~12 strands) single-mode fiber is US$1.50-2.00 a foot, maybe a little more, depending on the quantity ordered. Splice cases, termination, and related accessories probably work out to about US$2,000/ linear mile plus a little more per connection (splice or fusion).
Tools (fusion splicers, crimpers, hand tools, OTDR, etc)....probably another US$50,000.00 to $100,000.00 depending on what you get and the level of sophistication. Some money can be saved here by leasing the equipment from someone like GE Leasing.
Someone like Anixter can give you a more specific quote, but you'll need more specific figures for length-of-span, number of strands, burial or aerial, number of splice cases (burial or aerial), etc. Most places won't quote you media by the foot, they'll want an overall bill of materials, then provide you with a line-item quote.
Then you need to negotiate for the right-of-way, get the state and/or federal permits (environmental impact statements, etc), bonding and insurance (in case you trench up someone else's fiber or a gas pipe).
I'm sure I've left some thing out, it's been a couple years since I spec'd this kind of job.
Good Luck
Scott
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