Hope I did not do repeat posting, but since we mention this website of fr3b, I better warn everyone of what happened to my friend who had a bad experience. frb charges a high price for delivery of only sachet size products, and that period of time, one of my friend who have been a supporter of the website decided to write in and 'complain' about the cost.
She even posted on their forum, trying to ask them to consider revising a lower 'delivery' charge. However, they removed her post within a day (very efficient indeed), and from then on my friend never used them anymore. She says that paying 2 bucks for a simple sachet is way too expensive. So she decided not to feed them until they become fat.
I used them once or twice only.