I had lost 2 of the buttons out of one of the Disco keys on a trip to Tassie last year. The problem was also that one of the micro switches had fallen out when the buttons were lost. I ordered a unit from the following place in the UK -
VMKautolocksmith | Replacement car keys | Key cutting | Auto locksmith | Car locksmith which came with a new case (same as original), a spare battery, two new micro switches and a blank blade.
The pachage arrived within about 7 days and the quality of the parts is excellent. The price of $21 including postage etc was a no brainer in my case

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So if anyone is looking for a supplier of these parts, I can highly recommend them.
Cheers
Ian
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