If you've bought directly from Blueberry/Swaddlebees online, check your email in-box. I got an email for a survey that, once completed, gave me a coupon for $15 off a $50 purchase.
I just did a pretend order that totaled just over $50, and the shipping was $4.73. I think it varies a lot based on where you live, so it pays to check based on your zip code.
Re: PSA Blueberry Coupon