As Daniel stated, there are in fact homes for sale in Denver with seller financing available. However, there is an easier way to search than looking through the remarks. There is a field for loan terms in the MLS which includes an option for "owner will carry".
Again, that is a search that would require the assistance of a Realtor. If you are not currently working with someone, I would welcome the opportunity to conduct this type of search for you and earn your business.
Keep in mind, as a buyer you are not responsible for paying any broker fees. So if I do get the chance to work for you it won't cost you a thing.
Best of luck,