I can relate to that - I get $25 rooms at Harrah's in Laughlin simply by having a Total Rewards card and booking a Hot Deal in advance. I have also heard of people coming in off the street and getting the same deal. For a quickie overnight, I'd much rather do Laughlin than Vegas.
Be careful what Google, etc. says to get from I-40 to SLO. My mapping program sent me through LA - and when I added Bakersfield as a stop, it tried to send me over a very winding road from there to 101. CA-46 is a good way to get across the coastal range.