Free: Contests & Raffles.
I've had good luck at walmart.
I have to say the best two elk I have eaten were the lead cows I shot. I heard somewhere that lead cows are ususaly barren...they can't have calves. Because of this they are larger than herd cows as all their energy goes to them, not a calf once a year. They also have a lot fewer hormones raging during the breeding (hunting) season, which contributes to the flavor of the meat. They were fork tender and not the slightest gamey flavor to them. If you have a crack at one...take it!
On a more serious note and I'm notsure if this was already covered but you could get between their feeding and bedding area, and set up an ambush on the lead cow.