Unfortunately, Jeppesen (and Garmin) have you over a barrel. Their arrangement with Garmin makes them the sole supplier of the data for the card. That in turn obligates you to use their device for programming also. If your 430 is not a waas unit, you might find an older device for sale by someone who has upgraded theirs to a waas, as the older devices won't program a waas chip. Quite a deal considering the data is supplied to them free from the government!
There was also something about ongoing support from Jeppesen, but I don't recall the details. I'd be sure to check with them before buying anything older.