I have a StyleWriter 1200 (Uses BC-02 carts) that I used a lot back in high school (It's in storage at my parents house right now), the cartridges are extremely easy to refill on these printers. There is a small plastic plug on the side, all you have to do is remove it, fill the ink, and replace the plug. It also seems like it's fairly easy to find carts for them.

Also, and don't quote me on this, as I'm not sure, but I believe the difference between the BC-01 and BC-02 is the ink capacity.

I wish I still had my StyleWriters (They were both First model), but they both were fried due to a power surge, along with my ImageWriter II during a thunderstorm back in 2006.