I have a JBL 1200.1 that is for sale which is underrated and usually is bench tested at around ~1300-1400 @ 1 ohm or 2 ohms and am willing to let it go for $230 shipped.
I have an underrated Cadence ZRS-8 1500w @ 1ohm amp for sale, but I'm looking for $350 - $375 shipped. Great amp if you're willing to spend the extra money.