not sure if these are fresh flowers, but you can try Giftsflorist2000 or floristonline.
if u are interested in diy-ing, you can get materials from Golden dragon store at people's park there. Spotlight or daiso may have more diy materials too.
Some BS have wristlets/corsages in their bridal packages! But I agree with mintyrose that if you want, you can DIY and get materials from daiso/spotlight