i've looked into leases but never done it. the range ive seen is $1500 per person (this was sort of a membership to a small place with half a doz other guys) but guranteed water and about 15 miles from Habitat Flats; don't think it was a great location but i know they kill a few birds. another place about 8 miles from grand pass was $3000; don't know if it had a pump or not. and lastly, a place near Squaw Creek for $6000 + pumping costs. so its all over the board. for certain, its about location, location, location. and in my opinion, you can be close to a really good place like grand pass or habitat flats, but if you don't know the birds patterns, it might not be that great. you may have to just do the best reserach you can and then try something... and chalk it up to experience.
best of luck!