I hate to leave a negative comment about the ISI because I truly believe in what they do but I have never had a good experience with them.
The first time I ordered with them I bought three plants. One was not from that years catalog and I emailed first to make sure some were left. I was informed that there were so I ordered one. The plants arrived and when I opened the box only two of my three plants were inside. There was no note explaining why, no refund check, and I didn't receive an email about the missing plant. I emailed them and asked where my plant was. I got a terse reply that they ran out of the third plant and that I should have ordered it sooner. How would I know that it ran out in the time since I emailed asking about it?! Also, since I emailed ahead of time and said I wanted it, why not put it aside for me? If you didn't have it, then it would have been proper business etiquette to include my refund in the box or at least a note explaining what happened and that my refund would be coming soon. I was finally refunded the money.
Maybe a year later I decided to give them another shot and placed an order for another plant from a previous year's catalog. I was told that they were in stock and I bought one. The plant came in terrible condition covered in mealy bugs. It died shortly after I got it. It never should have been shipped with bugs! I emailed them saying that I should be refunded for this poor specimen and they sent a replacement. The replacement was in much better condition. Then, a month or so later I get an email from them asking when I planned to pay for the new plant! I informed them that it was a replacement and I shouldn't have to pay for it. It turns out someone in their finance department made a mistake.
Fast forward five years and I decide to try and order some more recent items and emailed them some questions and was told that they would check on the status of those plants and get back to me. Here we are two weeks later and even after emailing them I have gotten no response. Apparently they don't want my money.