I went to Sierra Natural Science's website a few months ago and requested a sample of sns217 for my spidermite problem. Well, so far they have sent me 4 packages with two 4oz bottles in each box (not all the same time). To top it off, it costs them $6 to send it to me! Too bad I already harvested when I got them, but Im sure I will need it again. If you want some free samples, then request away. It takes a few weeks but who doesnt need some additional expensive spidermite killer as part of their arsenal? I just requested more samples of other products.