My OGW Pineapple Guavas were on the small side, but they've been growing much more vigorously than I expected in just this year and my Mammoth already tried giving me about 10 or so flowers. (whose petals by the way are amazing and delicious!) I've never had troubles with OGW but I will admit that some of their plants are smaller than other nurseries offer, and some are over-priced, however, much of their stuff is cultivars you won't find anywhere else.
Most nurseries for non-tropicals like the Pineapple Guava begin taking orders for spring shipment in the winter, and stop around June-July. They usually get sold out of their more rare and unusual stuff by May, sometimes earlier. I always make sure to order my stuff in January or February.