|T. caliginosa, available online|
Tillandsias travel very well in a box for a week. They can be soaked prior to shipping, carefully wrapped, and sent on their way. As long as they don't freeze or cook, they will survive the trip. Not needing dirt is a very good thing! Other plants are much more fragile and can only be shipped during narrow time windows because of weather/temperature concerns. Some just don't like to travel; Lithops are a good example of plants that really prefer to say in one spot, and can freak out and collapse into goo when shipped.
|Lithops prefer a quiet life.|
Another down side is that you cannot inspect the plants for diseases or pests. I've never had a problem with either from my online plants, but it happens. So it's imperative to find a dealer you trust who will address any problems that come up.
I've purchased about a third of my Tillie collection from online dealers, and they are all thriving. I collect some pretty obscure species, so online sellers are high on my list. What have your experiences been?