I plan on just having my WC coordinate it. I imagine the extra stress of wondering if these things are breaking in my luggage, plus the extra luggage fees, I feel like I already have so much to bring.
As far as costco goes, I am not sure where but any taxi driver should know. I just figure I am going to get down there and I will want to worry about is a cold drink in my hand and haning out with family and friends is worth the extra money paid to a florist.