I believe Crystal is less seed to seedless guava. Anywho, I bought a Crystal guava back in August at Sunshine nursery in Rosemead. Price is firm and pricey. I think there might be other places that sell for a bit cheaper.
...one last thing, the Crystal guava I bought at Sunshine has narrow leaves. I know others mentioned their Crystal has fatter leaves. Which is the real Crystal? ...I dunno.