You can purchase Vital Proteins direct from their website, or buy it on Amazon — I recommend doing the Subscribe & Save Option, which when you get 15 % off, brings the price down to less than $ 37 / jar.
I purchase through the VitalProteins website — I include hyperlinks in the post for you to click on over to the different collagen products but here's the classic collagen: http://www.vitalproteins.com/health/collagen-peptides.html?acc=a4a042cf4fd6bfb47701cbc8a1653ada