Honestly, put an offer out on Reddit. Different sub-reddits will find you different groups with different demographics - it's diverse here.
I for one would be interested in sampling and reviewing products. In Canada, there's a hardware/consumer goods company called Canadian Tire that puts out a regular call for people to test products in exchange for a review on their website. Most people take it very seriously, even though it's volunteer work for a major corporation, and so you get great feedback on products.
Honestly, put an offer out on Reddit. Different sub-reddits will find you different groups with different demographics - it's diverse here.
I for one would be interested in sampling and reviewing products. In Canada, there's a hardware/consumer goods company called Canadian Tire that puts out a regular call for people to test products in exchange for a review on their website. Most people take it very seriously, even though it's volunteer work for a major corporation, and so you get great feedback on products.