Wedding guest book - drop box

I’m planning a wedding and I really want a non traditional guest book. I really like the idea of the heart drop box. We are going to have 150 guests and all of the boxes I’ve found only accommodate around 70 hearts. I could buy two, but they are somewhere around $40. Does anyone have any recommendations on a decent priced big drop box? Or how I could make my own? If I can’t find one, would I looks silly if I had people drop the hearts into a jar instead?