Or you could try making your own DX labels. Recently, I'd picked up an excellent condition Pentax P30t for cheap, but then discovered it required DX coded cartridges. After browsing through the web for DX label solutions, I'd decided to make my own using materials that I already had at home: aluminum foil, double-sided tape, and masking tape.

This example is for ISO 125 @36 shots:
DX_label.jpg