About the most bang for the buck is Behringer. I have had several and had no problems at all with them.
You can get something like a Behringer Xenyx 120FX for around 100. You can get even less expensive ones if you don't need effects in it.
http://www.bhphotovideo.com/c/product/422022-REG/Behringer_1202FX_XENYX_1202FX_12.html
DonM