Tis true - power chargers aka power banks are one of the hotest items on the market right now, and with the stories of exploding product in the US, ensure you are asking about battery quality not JUST price.  Nothing like client's asking you to replace their devices for them once that happens ;) Consider this though- while everyone else is giving out power banks - maybe your industry is already inundated with same and needs something fresh...that's where we come in...always. Fight the power!