Do a search, I had asked a similar question about buying a "good practice amp 15 to 35 watts" last week. Last count there were 27 replies on it.
After all the replies I came to a few conclusions. Everybody has their different favorites on the small amps. But the Fender Rumble, and Peavey seemed to stand out. Granted they are also the more expensive, being around $140 and $120 respectively for the 15w amps.
The best cheaper amp that seemed to stand out is the Hartke, Ive seen the 15w running around $80, and I think the 25w was cheap too, around $80-100.
But the bottom line is the cheaper practice amps wont sound all that great compared to larger combo amps in the 60watt+ range. So dont expect any great sound out of any of the small practice amps.
I settled for the Fender Rumble 15w, I got a semi used demo model at the local music store for $100 (actually $200 for a used bass, cable, and the amp). Sounds ok, but not nearly as good as my old Holmes 25w I got back in 1985. I dont think they make em like they used to.