It costs me a lot of sweat, some of my free time, and effort, to access a couple of the small horse farms I hunt.  I help maintain the horse trails, fix fences, and cut downed trees when needed.  There's quite a bit of hunting pressure around them too, but I can usually expect to tag birds there. 
There are a couple of big pieces of public land surrounding two local reservoirs that are only open to hunting by drawn permits.  I've put in for permits to hunt those lands for 6 consecutive years and haven't been drawn yet.
I know a few folks who allow me to hunt their land once or twice a year, through that is unpredictable at best.
I am starting a door knocking campaign next week at a couple more places I have my eye on.
Jim