I have a number of dragon fruit plants for sale @ $5 each. They are rooted "cuttings" and have all grown at least one extra segment on them. I have yellow ones (white on inside) and red ones (red on inside).
The yellow one - fruits prolifically and regularly, has very spikey fruit and spikey "branches", taste similar to pear and has more flavour than red one.
The red one - has non-spikey fruit, slightly spikey branches, and a mild flavour (a little bland), large fruit, fewer fruit than yellow one and fruits less often.
I am expecting my baby any day now, so don't be put off if I don't respond immediately.