No 2x DVD anymore in the Store

The Apple Store does not sell 2x DVD-Rs anymore. Only 4x and 8x are listed in the catalogue.
Safety concerns however have led Pioneer to limit the 2x writers in the past (models 103 and 104) so that these were not able to write faster than 1x on 4x medias: under some specific conditions, the drive could halt and the 4x medias could catch fire.
Which means all owners of 103 and 104 will very soon not be able to write any faster than 1x, since adequate 2x medias are desapearing, replaced by models with higher writing speed specifications.
To date, there is only one solution to overcome this limitation, but it is far from perfect: using a modified firmware. The risk to end up with a non functional drive is real. However, we have never recieved such information, exept from Pioneer.