What he said. With shipping, they are all within a few dollars. A dealer will sometimes offer a percentage discount for new customers but I've not seen one of those in a while.
It's $60-something about anywhere you buy one unless some individual on ebay might sell a used one.
PS, you will love having that tool. I personally prefer the 31. I do mainly big field and woods hunting, it's great. I don't kneel down till the plug is out of the ground.