You really have to look at your finances and the location and time of year:

I would start with your friend group to see if anyone in the area is looking for a place. I think it's ideal to co-sign and start the lease together. Equal footing etc. From there, it's just like normal apartment hunting, but the other person has to agree.

Second choice is finding someone who already has an established place and a free room. Either you jump on the lease at the renewal or your sign a subletting agreement. Friend of friends is better, but craigslist, or local college boards can help. If you have any hobbies, also check in with any groups/clubs/message boards in the denver area.

Your last option is to go in an get a place on your own, and then find a roommate to sublet to. Make sure the landlord is okay with it. Upside is you can establish the apartment how you want it, and your potential roommate can see how you live. Downside is you'll be eating the cost for at least a month or two most likely.

If you go the craigslist route (or any sort of message board): Some things I've learned. Write like a goddmann human being. So many postings get jotted off with spelling errors and no information. Don't write a book, but give information you would want to know when looking. When you get responses, don't bother responding to one-liners "I'm interested" etc. Only engage with responses from people who sound like humans. And remember, if it's too good to be true, it's a scam. If you think "is this a scam" - it's a scam.