Given the Black Friday sales coming up (and a $5 discount code you can get from [Black Friday Deal]Sofirn Aliexpress Store~Deal price for all products), I’d recommend Sofirn’s AliExpress listing. Don’t forget to also stack a store coupon (orange one) with your other discounts! Not sure about accessories, I don’t think there are any official ones (some people have taken to 3D printing a reflector to make it more directional, though).