I adopted a similar strategy for Tomotcha: we pick/sell only one tea each month. Most of our competitors send several samples each month, and from a revenue point of view maybe it's better, but I like the ability to give focus to a single tea. For instance our next shipment is a Genmaicha: it's a combination of green tealeaves and roasted brown rice. The first time I drank Genmaicha I didn't like it much, because it'…
If I like a particular tea, do you allow me to buy it again, afterwards? It would be reasonable, I think.
It really depends on the tea, if we still have it or if we can still reorder it from the producer. It will be pretty much impossible for a Shincha (new tea), as they are usually limited in quantity, and quite short lived. On the other end of the spectrum roasted green teas (houjicha) live much longer, so we can usually reorder them from the producer if we are out of stock.