Groupon is offering a $15 deal for $30 worth of custom M&M’s plus if you use EAT15 code it saves you an additional 15% off.
We purchased them in the individual bags. There is a 20% off coupon out there too.
If your M&Ms are broken or printed weirdly, you just call their customer service and they will send you a free replacement bag. The printing on ours was off center and I called them to complain and they sent over a whole new order. If you are getting closer to your date, they will even ship them quicker for you.