Harley Benton HB-20B

I would say that this is a valid option if bought as part of bass-bundle or something like that. Price is low, but so as the sound quality coming out of the speaker. It's usable as a bedroom amp, but the size of it, and especially the depth is not that great (which is expected for this speaker size and cabinet).
Aux input and speaker out I find most usable, as the sound there is decent, and it's great for practice. Overall considering the price, this is a usable peace of equipment for practicing through headphones, and if you want to let some sound out just for fun, but don't expect much more from it (if on a budget or in doubt if you will stick to the instrument, this is a decent buy...was my case...otherwise look for something with a bigger speaker and more expensive, I think it will make a significant difference in usability and overall experience).

Pros:
- Lightweight, AUX in, Headphones OUT, decent build quality

Cons:
- Small speaker, lacking depth, speaker not great tone, and burping on higher volume

I bought this amplifier in a hurry when I needed a small quick practice amp, and considering the amount of money I paid for it, it is quite decent.

By no means whatsoever is this a great amplifier, but it has all the features that you'd need from a practice amp, and the AUX input and earphone jack are nice features for practice amps. I don't know if it is this amplifier in general, or if I got a lemon, but it does not handle the low B very well.

A few months of regularly using this amplifier at a low volume, it has a decreased treble sensitivity. It sounds more dull than when it was freshly out of the box.

If you're looking for something cheap and portable, go for this amplifier, but of course, expect a compromised sound quality.