I'm looking to add 6 7-segment LEDs to my project using a MAX7221CNG+ chip. The instructions located at Arduino Playground - MAX72XXHardware, say there is no way to make a common anode-type matrix work with the MAX72xx and they only give examples for common cathode 7-segment LEDs. However, it seems that most 7-segment LEDs are common anode. I can only find a few common cathode ones and they are rather expensive.
Could anyone who has 7-segment LEDs working with a MAX72xx please recommend a place to get the LEDs?