I bought mine at Mothercare. But havent used them/didnt really need them. Thought they would be handy for travelling then went and forgot all about them. I think i have at least 3 which you are more than welcome to if you want
I looked everywhere in Dubai and couldn't find them so I eventually ordered them online. I don't use them anymore so you are very welcome to have them if you want?
Not exactly sure on place, but try checking with Mothercare as well as in pharmacies. Alternatively you might call 800 PHILIPS - they might help you locate the nearest store to you that have discs