Don't have any seed(lings) but I can organise a couple of cuttings if its of any use. The stuff roots and grows quite rapidly, keeping the skin nice and blemish free seems to be the hard part. Supposedly its used by some for grafts, I may well give it a try next year when my seedlings are a little bigger and the season more favourable. I haven't seen it rot down here in Melb when grown out in open with no special mix seemingly required.
For seeds you can also look at http://www.mesagarden.com/ their website is very basic and they only have seed lists with minimal descriptions but its a very extensive list and good value and they have always dispatches shipments to me with in days.
As Walker says the trick is to prevent yourself from ordering their entire catalogue of one species or another. Not to mention what to do with all the seedlings, unless you do a lot of trading or are very ruthless with how many you keep you will rapidly have an explosion of plants to tend.