I went with the cheapest ugliest looking ones there are and thank goodness! No running around buying $7 dummies from obscure shops if one gets lost. If you stick with the cheap cherry shaped ones from chemists you can get them everywhere. And they won't be too big if your baby likes to suck.
There's no advantage to using the pricier ones if you're not overusing the dummy. Just make sure it isn't stuck against baby's face and leaves plenty of air circulating around it.

