help finding mini speaker with speakerphone

[tritan]

so I don't want to take out my moms stereo in her car and add bluetooth or aux port when she is going to update it shortly. I am in search of a small speaker that can be portable that can plug into her 1/4 jack or bluetooth or both and adds speakerphone. I don't know if speakerphone is a must but small is needed. We are hoping for something that will fit in a cup holder and can power plug in for long trips. I see a bunch from Ihome , hdx and mini max but not all do the speakerphone. priced under 100 would be nice. I can't find my reviews on these. amazon reviews only go so far.

thanks guys.

matt