You can walk the strip from Mandalay Bay to the Sahara and get a lot of chips that way! Do it VERY early when the casino cages are less busy. Be polite at the cages. Show your money early. TIP! Be sure you know what you want. Many casinos have $1, 5, 25, 100 and a whole bunch of LE's. Do not go up to the cages and say, "What have you got?".
Stop at the Palms, they are very chipper friendly, accross the street is another casino.
Go downtown and do the same thing. Buy from Chuck Smorse or David Spragg or a few others that post regularly. Join the CC>CC! Come to the convention in June. Welcome to chipping! Check out too, lots of chips in bulk available too!