XI Audio Broadway S is a really interesting transportable headphone amplifier that is battery powered and it runs a pure analog discrete class A. It is priced at $1599.
LittleDot MK III SE is a fully balanced hybrid headphone amplifier by this legendary Chinese manufacturer. It pushes up to 2.5W per channel and it's priced at $499.
Cayin C9 is a flagship transportable fully balanced portable tube amp that can output up to a whopping 4.1W at 16 ohms. It'll cost you just shy of $1999.
The xDuoo XD-05 Plus is a mobile DAC/Amp that can work separately as each option and provides 1W of pure power through the headphone output. It is priced at 289$.
iFi Audio just released its newest product - the iDSD Neo. I'ts a stationary DAC/AMP combo with Bluetooth, balanced output, and unique, futuristic design. It is priced at 699 USD.