You are right about the contracts. However on a real level most big companies and alot of the medium size companies already have contracts with someone to do there installs. Its next to impossible to do business with companies like that unless you have tons of cash, workforce, and willing to do the work for next to nothing. Sorry dude you can always ask the managers of the stores you are interested in but other then that good luck.
This is CABL.com posting #199638. Tiny Link: cabl.co/mZ58