In CO you can get a cow license for about $250. If you have elk hunting friends here the rest of the costs would be the same as it is for locals. All the usual expenses including, but not limited to, transportation, food, ammo, any accommodations you don't bring.

If you drove, bought a cow license, had a place to go when you got here, brought everything else you need, got an elk and drove home.............$1200 minimum depending on how long you stayed and how determined you are to get an elk. If you are just wanting to kill one...its 8 am in Colorado right now, I can have you on one in an hour. If you want a bull add $600, more time and a couple years to draw the license.