I only know of OGW for mail order. One of the local nurseries near me in Portland, Oregon sometimes has Coolidge feijoas, but honestly I think those are also sourced from OGW.

Guava trees/shrubs in general do not produce much fruit for the first 3 to 4 years. It is perfectly normal for the flowers to drop off during their early years of growth. Guavas like full sun. If they are planted close to other trees, they will not produce fruit due to the shading. Guavas are fertilizer hogs but do not produce well with lawn fertilizer= too much nitrogen. I tried to copy a chart to give you an idea of how much fertilizer Guavas like but the copy did not translate well. Refer to the link below for a better look. Tables Table 2. Cultural practices for producing guava in the home landscape. Operation Jan Feb March April May June July Aug Sept Oct Nov Dec General1 Apply NPK Apply NPK Apply NPK Apply NPK Nutritional sprays2 Apply micronutrients Apply micronutrients Apply micronutrients Apply micronutrients Iron applications3 Apply iron Apply iron Apply iron Watering Water trees during dry periods, every 7 to 10 days and 1 time per week during flowering and fruit development. Insect control Monitor for Caribbean fruit fly, mites, and moth larvae. Bag young fruit and monitor for leaf pests year-round. Disease control Monitor for red alga and anthracnose. Apply copper along with nutritional sprays or apply alone once or twice especially during the wet season (May to October). Pruning4 Prune to reduce tree size and open up the canopy. 1, NPK, nitrogen-phosphate-potash. Dry fertilizer mix which includes nitrogen, phosphate, potash, and magnesium. Apply fertilizer 1 time during early fruit development and at the end of harvest. 2, Nutritional sprays are most effective during the warm parts of the year. See text for makeup of nutritional sprays. 3, Iron applications are most effective during the warm parts of the year. 4, Pruning may be done anytime during the year to control tree size and induce off-season fruit production. Severe pruning should be avoided during November through February to avoid possible damage due to freezing temperatures. Here is a link that might be useful: Guava Growing in the Florida Home Landscape

I liked it. Sort of a minty taste too. My brother had a hedge of the plant here in California. He and my sister in law didn't like them. Again,if your palate wants stone fruit or banana and the normal Supermarket fruit taste then Pineapple Guava might not be for you. They also are heavy fruiters. So expect pounds and pounds to rake up. One last- you have to scoop those small fruits. Maybe why they are not more popular is because you can't just bite into them as I recall....

You aren't telling us how narrow the spot is. But I don't think you'd be happy with the appearance of a Feijoa that must be kept sheared to a narrow silhouette. You might look at Podocarpus macrophyllus var. maki; it takes very well to shearing.