Matrix mint - cheapest place to buy?
Amazon had the best price last time I looked for it. However, I ordered the Syntrax Matrix sample pack from mybariatricpantry.com - and found that I didn't like it that much. I got a sample from Jenn too I think and tried it again - and nope, just not my thing. I would suggest (if you hadn't tried it yet) getting a sample pack. If you have tried it - then I would say to try Amazon.
Oh - and I love amazon - it has kept me in protein and other WLS friendly products. If you go there, I would suggest the prime membership - I don't know what the public pays, but as a student I think the Prime membership was like $35 or less - and you get free shipping on tons of stuff. I know that in the past year I have saved more than 3x what the cost of the program was...