Could you list the physical dimesions of the PSUs you stock.
A while back I brought an ATX PSU for a small form factor case. I knew that not all where the same size, but had assumed it was only a centimetre or so, so I did not specifically look for a small one, and by chance ended up with a rather long one, and found it a very tight fit.
Later when I was working on another PC, I had several PSUs next to each other, and saw how big the variation in size was. So I went to your website to order a small one, but you did not list the sizes. I ended up starting this thread, just to get a recommendation for a suitable small PSU, when I should be able to get that information from your website.