Do the bouquets or flowers need to be bought complete with the wand or can I just buy the flower(s) and attach it where it needs to go? Or do the flowers come with the needed piece at the bottom for use with your own wand?

Have a look at hughesmagic.com and you'll be able to buy the lot together with the best quality flowers available.

Richard is my first choice if I do get them. I already have the wand so I'm not really looking for a new all-inclusive set-up, just the flowers and perhaps the wand attachment so I can use my existing wand.

Looks like the wand bouquets themselves minus the wand itself are available. Now it's a matter of saving up...

I used to do a Wand to flower using a live single long-stemmed rose with just the stem and leaves down in the wand and the flower in my hand. I brought my hands together, taking away the wand gimmick in my other hand and popping the rose upright at the same time. It got a few gasps and a sprinkling of applause, so I know it was unexpected and the live rose was much appreciated by the recipient.