Another place to look for information on discount fruit trees is through wholesale tree magazines.
Local libraries would have information on any trade newsletters and magazines that would contain catalogs for discount fruit trees.
Advertisements in trade magazines for nurseries may contain information on dealers of discount fruit trees.
Many retailers will only sell discount fruit trees to businesses and nurseries. There are, however, retailers who offer discount fruit trees to both public and commercial markets.
Many retailers may not offer actual wholesale prices to the general public, but will make deals for plants bought in quantity.
If a company or nursery will not offer discount fruit trees to the general public, always ask if there is a price break for ordering in quantity.
One other option would be to wait until the end of the prime planting season and contact local nurseries. The nursery may have overstocked several varieties of fruit trees, and may be more than happy to sell the remainder at wholesale or discount prices than simply throw them away and lose money.