I hope you love these Ecuadorian roses as much as I do! There's something so inspiring about seeing bunches and bunches of blooms like these in markets and outdoor pavilions that brings life to whatever you're doing.
One of my favorite things to do in LA is hit the floral district to see what's popular, what new varieties are in season and whatnot. It's great to just go and fill your mind with cool designs that you can incorporate for yourself.
If you're getting married and want to fill your mind with as many flowers and greens as you can handle, then definitely hit your local floral district (if you have one). Most major cities have them, though, not all.
Carlsbad, California has a floral district that not many people know about. It's a bit out of the way for me to hit, but when I am heading to San Diego, I try to leave enough room to make a stop and pick up some flowers. I love this location because they tend to carry items that you won't find (commercially) available in LA, if you can believe that. Stuff like pepper berries, pepper fines, rice flower, French cotton, etc.