In this occasion I found a vendor from eBay that surprised me with a
better than expected pre-bonsai tree; a serissa foetida.
This is the vendor's site, and
I highly recommend him:
http://stores.ebay.com/The-Little-Bonsai-Store
The prices and items are similar to Miami Tropical Bonsai which I believe is highly regarded here in Florida. I think somebody at my local club recommended it once.
Very positive experience overall. He/she lists bonsai plants in a Dutch type option, and lists several bonsai trees at the same time, but has no individual pictures. I think that in Dutch options price is pretty much fixed if the number of bids is less than the number of trees; he usually sells a batch of trees at the time.
In my case, I bought this serissa foteida for $19. The link to the eBay item might not work anymore after a while, but here it is:
http://cgi.ebay.com/ws/eBayISAPI.dl...item=4428694147
I am attaching a picture of the actual bonsai tree with a 3/4" inch trunk. I took some cuttings out of it for a project, so it used to have more foliage.