The cheapest quiality neck I know of is what the guy called "olliedan" is selling on ebay for about $100, it is good canadian maple but quite raw work, no options and needs some additional tuning (rolling off the fret edges etc.).
Sorry to hijack, but I have one of Ollidean's necks brand new that I'll sell for $75 plus shipping from NorCal. Maple on maple with beak, and the frets are pretty good too. I bought it a little while back, but haven't had time to do anything with it, and now I should sell it since recently I've done too much buying and not enough selling. I was planning to list it under classified, but just been busy. PM me if you want it - long day at work today but I can send pics tonight. Marsmountain can have first dibs - as Steve noted, you might have to chop off the headstock and reconfigure to get your desired reverse banana, but it certainly appears you have the skill. Or use it as is, come in under budget and be happy. I can include some nice chrome Gotoh tuners off a Focus for $20 more.