I did not look closely yet, in week 1 and 2 next year I have days off and have more spare time to look for parts.. Now just in a glance I found this:
http://m.ebay.com/itm/2-x-9mm-CTR-S3W-B5...nav=SEARCH
100Pcs/lot SMT 6x6x11mm SMD 4Pins Tactile Tact Push Button Micro Switch Momentary 6*6*11mm
http://s.aliexpress.com/yUnq2uyA
http://m.ebay.com/itm/2-x-9mm-CTR-S3W-B5...nav=SEARCH
100Pcs/lot SMT 6x6x11mm SMD 4Pins Tactile Tact Push Button Micro Switch Momentary 6*6*11mm
http://s.aliexpress.com/yUnq2uyA
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