i dont think amps move as quickly as pedals and guitars... anyway the sale is a showroom sale, that means they were selling off stuff on display only. on non-sale days, i'm sure there's plenty in stock. the ibanez soundwave line are great amps, real value for money
at that range you should check out the hartke's as well, at citymusic. so happens i called them a few days back to check the price of a hartke a70 (70 watt, 12 inch speaker) it costs 400 odd if im not mistaken