Here's an excellent condition Used Marshall DSL5c 1x10 combo. This amp is a blast to play at 5 watts, but can go all the way down to .5 watts for even more bedroom-friendly rockin'. It's two channels make it crazy versatile, too, especially with the included on-board reverb and effects loop. It does have a few tiny tolex blemishes and one of the rubber feet is missing.
Here's what Marshall has to say:
With a 10” Celestion Ten-30 speaker, perfectly chosen for great sound at low levels, this 5W amp provides you with the chance to experiment in your own home or at rehearsals. The variety of features mean that it can be used for multiple genres, anything from blues rock to heavy metal.