There's also a stand at the YC/BC just past the slide on the sidewalk. If you're planning to do this you might want to take a chain from something you already have to save a few dollars.
I'm not feeling so budget after reading the previous posts... DD8 picked a pearl as her one souvie last month. It's beautiful and she loves it. Actually, she's wearing it right now... She chose the smaller silver dolphin pendant for mounting. The total - for pearl, setting, and chain - less than 4 weeks ago was $63. I was tempted to use a chain we already had at home but the 15" sterling chain was only $11.99 so that wouldn't have reduced it by a huge amount.
DD19 picked a pearl in the Japan pavillion at least five years ago and I remember being shocked at the price after the oyster was opened and we had to do something with this pearl. She ended up with a small signed Wyland 14K gold setting with three dolphins that we were told they don't make any more. It is nearly identcal though to the gold circling dolphins pendant that they have now.
If I remember correctly, DD19's pearl with just the pendant - we used a chain she already owned that time - was around $120. The pearl lady who showed me the replacement for that piece last month said that setting was $93 now and they've added an earrings option to it. Next trip, I want her to take her necklace along to see if the earrings will match then maybe we'll pop for two oysters to celebrate next summer's trip and her 21st bday...