First off, apologies for the serious reply 🙂
Not an expert on them but did a bit of research a while back prior to a purchase. There seem to be 3 main types,
(1) fan resistance as per Concept 2 mentioned above. Concept 2 seems to be the market leader and the one used in all gyms due to the quality\durability. These are in the £900 region but really hold their secondhand value.
(2) Water resistance, Similar to above, tend to be quieter (the sound is water resistance). Reviews think these are closer to the real feel of rowing. Also in the £900 region for a reasonable rower.
(3) The rest
Not sure if you’re looking new or secondhand. Like Turbo trainers there was a huge demand \ shortage during lockdown with the associated artificial price inflation.
I got a secondhand water rower which I’m very pleased with,
Older version of this https://firstdegreefitness.com/shop/fluidrower/e550/
As per @gaidong, I sometimes use mine with a TV in front but with bluetooth earphones.