Long ago I had local geek friends and sometimes we would chip in as a group and buy a bunch of something that was cheaper in quantity. I know that's not a bright idea over the net but I also know that if enough people want a thing at a better price then one person has a chance to get rid of excess after buying a bundle.
I've done this locally in my poor neighborhood with MP3 players and it worked fine but those were all people I knew who did buy from me at cost when the players came in. I didn't get stuck and everyone got factory refurb Sansa players for $12 ea just in time for Christmas giving. Same player new at WalMart was over $30. Part of my aim then was to raise awareness about prices and group action, poor don't have to be so poor, but that did not get through so well as the only pro-active one was me even after making the point.
So I am here now and there's an item that when 100 are bought costs 5 Euros each but when less than 100 are bought costs 20 Euros each. It's an audio module that I believe could work well and easily (I struggle with some others< STILL) with or without an MCU. I plan to get one to test and if it's what I think, figure out how to buy 100. I know someone who will want 20 and I will want 5 to 10 but the rest, I need to see if there will be takers after the units arrive, knowing that shipping won't be free.http://www.vlsi.fi/en/products/vs1000module.html
VS1000 Module provides a quick and low-cost way to add high-quality analog stereo output to a system. It has industrial qualification and long term availability that makes it attractive for many applications.
Plays audio from micro-SD card or internal SPI Flash (or both)
Can be customized, both firmware and content
Can copy audio content and update firmware from micro-SD card to internal Flash
Triggered via USB, UART or IO pins
Line-out or headphone stereo analog outputs with SNR>90dB (A-weighted)
High-performance license-free Ogg Vorbis decoder
Supports variable bit-rates and many sample rates
Plays from internal Flash up to 20 mins, play time can be extended to several days by using micro-SD card
Firmware customization tool VSIDE is available for free
Single power supply 3.4...5.5V, Note: IOVDD is generated from internal regulators, IO pins are not 5V tolerant!
Industrial temperature range
Note that the IO pins are 3.4V only, need voltage leveling to use. But it has USB and UART IO which I'm pretty sure that USB is always 5V and I think (please help here!) that UART is the same 5V as our serial and software serial.
Anyhow this is just to see how the idea is received.