I wish there were more of these. "Please test this speaker and I will donate 10% of it
Well, why not to organize kind of a crowdfunding in the following way:
Everybody may put a request for a product to test.
Condition: I need to specify the purchase price.
And bid for at least, say, $20
Then, anyone who wants this product to be tested may increase the "pot" by his own bid.
When value is reached, people receive, say, a PayPal invoice, and then you purchase the good and test it.
Maybe we could optimize it if we say we go only up to 60% of the price, and then you sale the device and keep the money.
Did you try something like this ?