Are there any AVRs on the market that have an inbuilt sub amp to power a passive subwoofer ?

Almost all AVRs have a sub pre out which needs to go into a separate sub amp, the sub amps tend to be very expansive, but i wondered if there way an AVR with an integrated sub amp ?

I need a separate sub amp as i want to use an in ceiling subwoofer which is passive as opposed to the standard active floor standing subwoofers.