We're wondering now if we can do away with the base station entirely and have the blocks communicating entirely wirelessly.
You can eliminate the base station and the wireless by putting a "musical greeting card" chip and speaker in each block. Record the sound on the chip and have it play when the button is pressed. This supplier sells them for $0.50 each and has a minimum order of only 50: http://www.alibaba.com/product-gs/548080936/greeting_card_music_chip.html
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