As a violinist, I'm always looking for a relatively inexpensive way to improve my sound. Finding a great rosin falls under this category. I've tried Liebenzeller rosin, Tartini (Andrea Solo) Rosin, Pirastro. I once tried a rosin that came in a cool looking, round wooden box. However, I do think that Baker's rosin is superior, really gripping the strings well, without creating a lot of dust. Most rosins have been in a store room or on a shelf for months, drying out and becoming less effective. Baker's rosin is produced fresh every season, and is apparently made from real pine sap and high quality additives (bark, resin, metals). It smells great and the packaging is smart. There are two kinds, amber and citron - the amber colored one seems to grip a little bit more and the citron tends to sound a little glassier.
To buy Baker's rosin, go to http://www.bakersrosin.com/ and ask to be put on their mailing list. The rosin is made seasonally. It seems that there is usually a batch completed around December. About $22.