"Brad Salai" writes:

[...] I was just trying to find cards for less than the $130 each
that Garmin charges for them. If they are 256 meg SD cards, that is
way higher than they can be gotten for elsewhere. [...]

According to the Jeppesen Skybound USB card writer thingie,
modern 430/530 data cards have a mere 4- or 8-MB capacity.

- FChE