The best place I found is Stockroom. Avoid over-tightening the clamps. Who Is The Bitch Now! Pussy pumping also puffs up the outer labia. Not sure where to start with things? It is easier to put the clamps on if the edges of your labia are dry or at least not slippery.
The clamps are advertised as nipple clamps but they are excellent for labia stretching.
Enlarging Your Labia