Not positive on exact prices since it's been awhile since I've had one collected, but that sounds pretty right. Have bought some cattle from Voglers a few years back, and was impressed - I believe it to be a quality operation ran by good people. There's also Reproduction Enterprises at Stillwater, OK and Great Plains Breeders in Shamrock, TX that could be as close to you if you're far enough south and/or west. I've always used Great Plains, and been very happy with them.
Last I knew spots in the display area in the yards at Denver were booked a couple years in advance and if you needed one this late in the game you were at the mercy of anyone that might have a spot they weren't using that they were willing to sell. Whatever that might cost plus a nice sign and some nice flyers and a few days in Denver for you and whoever you take along, plus full page ads in the publications of your choice. It's not cheap, but it's all neccesary if you want to sell much semen. Not trying to discourage you, just make sure the bull's worth it - but if he is it's a great ride.