Why does your listing state that you "have no idea what this flower looks like", yet the image is of a plant in bloom? is the listing not for the tree in the photo?
I'd suggest you do a little market research on pricing; IMO, the decimal point is one place too far right on this and the wisteria seedlings. By comparison, this azalea is the same height, but obviously further developed to have a trunk, listed on FB auctions at $450...and didn't sell.
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From the OP EBay link:
Specimen Bonsai Satsuki Azalea 'Takao'
This is a specimen bonsai azalea imported from Japan a couple years ago. It is currently growing in a training pot with Kanuma soil and some sphagnum moss on top to prevent the soil from drying. This species is known as "Takao", I have no idea what this flower looks like as it was bred in Japan and was told that this is a new breed of azalea. From what the many buds look like, it appears to be a white flower or pink with either orange or red stripes. They will most-likely look like the ones in the first picture up above. This azalea will flower very soon, around late April to May. From the pictures given, this species has tons of flower buds waiting to explode, I can't even count them all. I would have to say that there are over 30 blooms on each major branch. In other words, there are probably around 200 or more flowers that are getting ready to emerge. I know you would not want to miss it! This tree would make a great plant for any collection or bonsai enthusiast, and will be a complete show stopper in a month or so. Do not hesitate to make me an offer, or buy this tree outright! The tree will be shipped with the pot, but it will have to be transplanted next year, or right after the flowers emerge.