GP2x Store have let me know they only have a few flash carts left, heres the listing of price changes:

DS-X 4Gb Flash Cart
Offering a SINGLE unified solution which allows you to do the unthinkable and...
$94.99 Sale Price: $74.99

Supercard Lite Micro SD
Supercard Lite is a miniature mobile NDSL file Manager and Bakup device. To...
$54.99 Sale Price: $34.99

SuperCard DS One
As the first extra flash memory game cartridge, SuperCard team has been...
$54.99 Sale Price: $32.99

SuperCard SD Slot 2
SuperCard SD is a miniature mobile GBA(SP)/NDS/NDSL file Manager and Bakup...
$44.99 Sale Price: $24.99

Supercard Lite Rumble Micro SD
The Supercard Rumble uses a Micro SD and features a rumble system which can...
$34.99 Sale Price: $23.99

Get them while they are hot because once they are gone they are GONE, GP2x Store come very highly recommended not only by DCEmu but by many other big emu/homebrew sites.