Went to the site to pick up the Jane Iredale Just Kissed lippy that was sampled in a recent box. That is $25, so I tried all the codes. Only BBJETBLUE15 worked for me (15% off), but it still worked out well. I ended up adding on the Marcelle Hydra-C set for $42 and the mystery sample pack of course. I had some points, and I ended up paying $26 or essentially the price of the lippy that I was going to get anyway. Instead, I also got the sample pack and $72 worth of other products...plus the 50/50 shot on the sample pack.
As an aside, the Marcelle set is a great value if you liked the gel they sent out this month. The product volumes are all listed, and they are all full size. The description says it also comes with a pouch. It's the gel (which is $24 alone), eye gel-cream, exfoliator and cleanser. The product RV is $67, so I assume they are saying the pouch is worth $5. FYI in case anyone else liked that sample.
This sort of thing is why I consistently stay with and come back to Birchbox, even with some pretty meh (and also pretty amazing) box months.