We've been hearing about Jawbone's follow-up to its Jambox wireless speaker for some time, and now a listing on Best Buy's site shows how much we might be paying for the rumored system. The product page has since been taken down, but a cached version shows the Big Jambox listed for $299.99 — $100 more than its smaller predecessor. Meanwhile, the listed specs are similar to what we've heard before — the device is expected to measure 10.25 x 3.25 x 3.75 inches and weigh in at 2.8 pounds. There's still no word from Jawbone, but with mounting evidence of its existence — which includes an FCC filing and since-pulled Amazon product pages — it seems like only a matter of time before the Big Jambox is made official.