The Xbox 360 price cut rumours we’ve been hearing for September look to be gathering even more steam, as this RadioShack ad shows drops to US$399 for the Elite system and US$199 for the Arcade. That’s down US$50 on the Elite and US$80 on Arcade, making your choices a nice smooth progression of Benjamins–US$199/US$299/US$399. The drops are rumoured to hit early next month. UPDATE: We’ve also just heard from the folks at setteb.it, who have news of an official 60GB upgrade to the 20 GB Xbox 360 system at the same price, €270 in Italy. [Joystiq]