Go to www.silverstrikers.com first and make a list of all the casinos that have machines then get a map of LV and plot your course. Make downtown one day and the strip one day then across the freeway to the Palms for a day. You can also check the casinos that used to have the machines and they may sell them at the cage for face value. Take a camera bag to carry them in and load up.
PS it is cheaper to go to Jackpot auctions for most of them.