if ye get a mouse with one button ye should go to ye preferences and click the keyboard & mouse button and click the mouse tab and set it like so:

and ye should be able t'right click. or ye could borrow someone's mouse and edit one of ye shortcuts as /loot and have a set a key to use the /loot commad and give the mouse back to the person and not have t'buy anything.
and I heard if you do a 3 finger tap on the mouse pad you can get a right click or if you put two fingers down and tap once on the right side ye can do a right click..dno't know for myself..let me know what you find out.