I've been wanting to pick up a PBC for awhile now and they regularly sell for $40+. I ended up getting one of the db_elec ones (they usually sell for ~$30 unless you splurge for one with FM sound). It doesn't play the cards, but I have a Master System for the rare occasion I want to play them. I just like having fewer systems hooked up.
On a side note, the Retron 5 is compatible with the db_elec converter and has the ability to play SMS games with either the original soundtrack or the FM soundtrack. It has me playing many of my SMS games again just to listen to the different musics as I've never had a console that could play the FM version.