Free: Contests & Raffles.
I don't think it's totally out of the question to load a 30/06 cartridge to produce 3000fps. Factory loads with 125 grain bullets claim 3000 or a bit more.
The 30-06 is nothing but a anemic .308 Winnie with a little lipstick on. Skip the learning curve and go with a .300 Wincheter Magnum.