For the benefit of those who will be coming into the state in the near future and if your route involves toll roads, its going to to get more costlier (somewhat). Starting in Jan of '18 the tolls will go up by 2.5 percent. That means a trip to Oklahoma City on the Turner Tpk or the Will Rogers Tpk east of Tulsa will increase from $4.50 to $4.75 (if using cash), though it will be cheaper if you have a Pike Pass or a Toll Tag (TX). Unfortunately it will go up again on July of 2019.
In the near future, toll roads throughout the state will go "all electronic tolling", meaning that there will be "no manned toll booths" to take cash. Taking its place will be gantries that will take a picture of the license plate and will mail the fee to the driver (at a higher rate). Its the same system being use in the Dallas area and in most states. Speaking of unmanned toll booths, there are two in the OKC area. They are the Kilpatrick Tpk and the H.E. Bailey Tpk (Norman) Spur. There are change dispensers at the gate.