These most expensive numbers so far are pretty weak.

That's what you get when it's all-grain brewers... from an extract brewer, my most expensive so far is $77.50 for a Dogfish 90 Min clone.
I keep cost break-downs of most of my beers, so here's the break-down if you're interested:
Cost: 35.00 (7.5lb DME @ 13.95/3lb) + 12.95 (3.3lb LME) + 6.50 (yeast) + 2.00 (grain) + 12 (3oz Amarillo) + 4 (1oz Simcoe) + 5 (1oz Warrior) = $77.50 ($1.55 per 12oz / 9.30 per 6-pack - still cheaper than actual Dogfish 90Min!).
Cheapest batch so far was probably around $40.