One of my favouritest-ever plant bloggers started offering plants for sale last year. In the spring, he put up a plant list; a few weeks ago, he opened it up for orders. Later in the season, new plants may become available.
It's not too far off the mark to say that Mr. Subjunctive at Plants are the Strangest People is one of my biggest plantaholism enablers. He blogs about cool plants; I buy plants from eBay or elsewhere. He makes a funny joke; I buy plants from eBay or elsewhere. He goes on vacation; I buy plants from eBay or elsewhere.
You see? It's really all his fault that I have so many plants. Not that I need much encouragement.
So, when he posted his plant-sale list this year, I was all over that. I purchased an Anthurium seedling mongrel that he grew from seed he got from his own plants, a red Cryptanthus, Eucharis x grandiflora, Furcraea foetida 'Medio-Picta,' Monstera deliciosa cuttings, Selenicereus chrysocardium, Syngonium wendlandii, and a gray Yucca guatemalensis to replace the one from him I had had for about a year before the USDA burned it.
How to Pack Plants for Mailing" post that explains his process. I also know to check each bag in the box, because there might be a hidden plant or a plant part that could be propagated in one of them--in fact, I found a few chunks of Selenicereus chrysocardium in one of the bags. Granted, that was the bag wrapped around the potted plant, but still--if I weren't paying attention, I would have missed the opportunity to propagate two extra plants!