IKEA's tiny, stackable Kallsup speakers let you 'build your own sonic skyscraper', and they're on sale now for $10 each

IKEA's Kallsup Bluetooth speakers are on sale now in the US for $10 They caught our eye at CES, and were originally set for an April launch They sound impressive for the price, and you can pair up to 100 of them IKEA's…