If worse comes to worse you can always buy empty bottles at the lhbs. About $9 a case and you can reuse for life as long as you make your friends give them back when you supply them samples... I purchased about 4 cases regular bottles and 2 cases of swing top pints when I started.
Since then, I've amassed many cases by drinking 'pop-top' beers, having friends keep me cases who drink 'pop tops', etc. This is the best method IMO.
Edit: If style isn't really your thing and you plan on drinking them in short order, plastic soda bottles, etc. will work. Have your coworkers save their 20oz. coke bottles, etc. This is as chincy as it gets (they are white so they dont protect the beer from light), the plastic will probably let some oxygen in over time, etc. but it will work in a pinch. I keep about 6 A&W 20 oz. brown plastic bottles around to bottle 'extra' beers (when you get 50 out of batch but only have 48 glass bottles) and they work fine.