I purchased some fruiting cacti arms at the CRFG meeting this year. There was a "blueberry" cactus, "raspberry" cactus", and a hybrid "raspberry / plum" cactus. The blueberry is quite unique and makes a small blueberry sized fruit that has a taste of raisin, the raspberry is a very small prickly pear that is spherical and quite tasty, the raspberry/plum I haven't had fruit from, but appears the same as the raspberry just a bit lighter color, and I also purchased one of the peruvian apple as well, but also haven't had fruit. Hopefully that is enough information to chase them down.
They are rooting now.