How do we go and get seed for seedless fruits? Wouldn't we eventually run out of seed? ...

My modern bonsai freshly shed adjectives it's leaves....
Answers:    The short answer is that farmers, gardeners, horticulturists take supremacy of the fact that abundant plants can produce fruit without seed, so that the consumer does not have the inconvenience of separating seed from the fruit when eating them. Sometimes this requires special growing procedures, or reproducing plants by graft or cuttings. See the link below for detailed discussions almost a number of seedless fruit.

http://www.madsci.org/posts/archives/200...
Where can I buy plants/seeds communication demand surrounded...
I don't know, I guess they come from hybrid plants and they only just continue to graft and spawn new ones when they die.