Anyone know where I can find another amp like this for my sub set up

[Nibz]

I’ve got a Gx gaming set up I only use the amp and sub and I have presonus speakers connected via RCA cables the subwoofer for some strange reason is also connected via 1 rca cable I’ve been looking for an amp that would allow me to connect my 2 rca speakers and 1 rca sub does anyone know where I could find one for a budget price? I’ve attached photos of the sub requirements and the amp I already use