There are paid shuttle services that were less than $10 to the strip hotels the last time I checked. However, I take a taxi because it is much faster, and depending on where on the strip you will be staying it is usually under $15 if I remember correctly.
The last limo price I saw was $50 plus tip to a strip hotel, but I got the idea the guy had been stiffed and didn’t want to leave empty, so it may be more regularly.
Also, check with your hotel. Some of them have free shuttles to and from the airport.