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 You can pay anything from $4 to $40 for a silicone cup. I have yet to find any compelling reason to pay more. The expensive brands have more limited designs and the one I like best isn't even made by any of them. 

The low price means that things can be done correctly. Try a few sizes and style find the one that works. Then a set of 6 should last you about 3 years. 

2/ 
 If you are worried about changing it in public stalls, just remember you can leave them in for 12 hours vs 4 for tampons. They won't interfere with other business that you might need to do while out and about all day. 

They don't last "forever" since they get soft and should be replaced from time to time but it's still a lot less waste than tampons and frankly when you find the right fit less gross. 

3/3 
 @134318c2 I've been using a single mooncup (bought for around 20 GBP) since about 2007! Absolutely the best purchase in terms of minimising waste and expense, and I personally find  it much less dysphoria inducing than other menstrual products.