Depending on how long you intend to stay in Vegas, we parked at the back of the Bally and Paris for 3 nights with no issues $0 except casino play which probably worked out to more than $50 a night (LOL). Worked perfect for us. Also Main Street Station $16? night, can be tight on space, a little noisier and not as nice an area but many report staying happily there down near Freemont Street.
If we are staying for any longer than 3 nights we'll typically stay at the Oasis Las Vegas = not cheap but much nicer to relax in than Circus Circus and we walk 10 mins or so from it down to the outlet mall, where you can either walk up the strip (we like to walk all the way to the Tropicana from it) or catch a bus up there. The Oasis also runs a shuttle to the strip about 3 or 4 times a day and evenings.
3 nights/4 days is usually enough of the Strip for us, so boon docking behind Bally's works well most times for us, then we can head out to Sam's town or towards Pahrump or South. Lots of places to go after our fill on the strip.
