Need an advice about menu items

[COLOR=#000000][FONT=verdana]What is the best way to make a menu with items that can be bought ( a.k.a shop ), bought items are invisible and there are about 20 items or so.[/FONT][/COLOR]
[COLOR=#000000][FONT=verdana]What’s the better approach than adding mouse event listeners to all 20 items?[/FONT][/COLOR]
[COLOR=#000000][FONT=verdana]Any help would bee appreciated.[/FONT][/COLOR]
[COLOR=#000000][FONT=verdana]Thanks in advance [/FONT][/COLOR]​:)