There are definitely many more low-power tube amps available now. There are some really neat ones in the 1.5 watt config. Even still, I think there is room in the market for more.
If you already have a larger tube amp for gigs and are obsessive about the tube tone, I'd recommend searching for "power scaling" and "amp attenuator." You'd be very surprised with the sounds you can achieve at decent volumes. You can buy amps with power scaling built in or you can retrofit the circuit. Attenuators vary in quality, but they are easy to use external devices. I'm addicted to tube amps...and I used to like playing in my office in downtown Chicago to blow off steam. I often used a 30 watt amp with an Air Brake (attenuator) and I never got into any trouble because of the noise. I was able to use the same amp to play a gig in Grant Park on a Saturday and then to play in my 10 X 12' office on Monday.
If you already have a larger tube amp for gigs and are obsessive about the tube tone, I'd recommend searching for "power scaling" and "amp attenuator." You'd be very surprised with the sounds you can achieve at decent volumes. You can buy amps with power scaling built in or you can retrofit the circuit. Attenuators vary in quality, but they are easy to use external devices. I'm addicted to tube amps...and I used to like playing in my office in downtown Chicago to blow off steam. I often used a 30 watt amp with an Air Brake (attenuator) and I never got into any trouble because of the noise. I was able to use the same amp to play a gig in Grant Park on a Saturday and then to play in my 10 X 12' office on Monday.