An Off-the-cuff way to get someone's consideration, much like a whistle, can be a hissing sound: "pssiu!" It is far from perceived as impolite, but gets seriously irritating if recurring as well often. As a standard rule, the bigger the town, the dearer the services may be (as an example, https://wiki.extraordinarz.com/profile.php?user=allan-ragan-146601&do=profile