Free: Contests & Raffles.
Definitely go with the HD/ED/LD quality glass. The suffix varies from one manufacturer to the next but will consistently put you in the top tier of that manufacturer's range. Plan to spend $1,000 or more unless you can fine a screaming deal on Craigslist. Consider the Leupold Gold Ring HD, Zeiss Victory, Nikon EDG, Vortex Razor, and of course, Swarovision. Let us know what you pick.