Rolex bezel insert for cheap, where ?

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Hi guys,

I experimented some bezel aging with bleach and it turn out not that good for the moment. I wonder if any of you might know a source to buy some cheap sub bezel (even the low quality ones).

The only ones I found right know are the one from the bay and I would like to experiment a little bit so I don't feel like trashing away 8$ each time I make a try