I'm trading some items for black roses and any missing balloons. Here's what I need:
Balloons:
Bunny O. Balloon
Bunny B. Balloon
Bunny P. Balloon
Red balloon
Orange balloon
Yellow balloon
Green balloon
Cyan balloon
Blue balloon
Indigo balloon
Pink balloon

Around 50 black roses

And here's what I have to trade (1:1 for black roses, 2:1 for balloons):
Hybrids:
Gold roses x31
Blue roses x69
Blue pansies x64
Blue violets x21
White carnations x8
Purple rose
Purple tulip
Purple pansy

Balloons:
Heart Y. Balloon
Heart G. Balloon
Heart I. Balloon
Bunny I. Balloon

And I can always pay bells! (No more than 150k each for black roses and balloons)

Let me know if you're interested