Amazon offers the Creative SoundBlaster X-Fi Surround 5.1-Channel External USB Sound Card
, model no. 70SB109500000, for $39.99
with free shipping
. That's a $15 overnight price drop, $5 under our April mention, and the lowest total price we've seen for a new one. (It's a current price low by $15; we listed a refurb for $5 less also in April.) This portable USB-powered external sound card features THX TruStudio Pro and supports Dolby DTS-based audio decoders.