I stumbled upon the Cloud CXA450 amp which has 4x 50w channels.
being the 2 channels for the .2 are powered, that would necessitate the use of passive subs, which I know exist but otherwise am entirely ignorant about.
the price is good, which is why I wonder…however, if you think a 2.2 setup using powered subs is possible for a similar price, my ears are open. I just suspect you could do that with a $700 budget but not so much with a $300 budget as that’s a heavy discount on an amp that Google shows me to be well thought of.