Welcome aboard ! First question is have you looked? They are a very common item in the boat catalogs. I Googled this and came up with many avenues to order from.
I bought MSC 3 bow bimini top boat cover on amazon, excellent quality and price and it comes with all the hardware and cover boot! To top it off, it comes with a 2yr warranty on materials and 5yr warranty on frame. It is easy to install and stable. Perfect height and size for my 19' Stingray bowrider. Good shade and grey color helps cool us down from Florida heat. I have looked everywhere and this is 50% cheaper than other brands out there!