The Wyoming Department of Revenue, along with other states and many cities, has taken on the on-line reservation companies over how those taxes are computed.
Some folks in KC knock it for being too highbrow, though there are still no tablecloths and it is not especially expensive, but sometimes t is nice to make reservation rather than wait (sometimes hours) on a long line.
The agent told me that Delta had a special deal with Hotels.com, which is owned by Expedia, and that at the same time that I purchase my ticket she could transfer me on a direct line to a special desk at the Hotels.com reservation system and that I would receive a 25% discount.