Hi, I can't help much with sources but these links provide more info on other "B"'s... I've seen Fuerte, Bacon, Stewart and Zutano at Lowe's. They should get more in the next couple of months... ask them when they expect them. (Stewart can also be an "A" type in some areas but it's said to be a "B" around Irvine.)

http://ocfruit.com/files/Avocados.htm

http://www.plantsthatproduce.com/guides/PlantingAvocadoOrTwo.htm

http://www.ucavo.ucr.edu/AvocadoVarieties/AvocadoVarieties.html

Thanks a ton, MB. I'll check out those sources.

This is my faorite avocado site, but it's not listed there. Maybe you can check it out for ideas, though??
Carla in Sac

Here is a link that might be useful: http://www.tropicalfruitnursery.com/avocado-viewer/index.htm