We have these UNIQUE DSTT carts for sale [sometimes known as NDSTT], which based on reviews is a superior product to R4 revolution (R4DS). Superb compatibilty and playability.

• DS original cartridge size, Slot1 interface.
• Plug n Play, easy to use, just Drag n Drop file from PC to flash memory card.
• No FlashMe, built-in NoPass, and the GBA cards in slot2 can be started directly.
• 100% SDHC TF and standard TF compatibility up to 4096GB
• Supports CleanROM, No convert
• High speed SDHC. Supports any TF card speed with no lag times.
• Supports Moonshell and homebrew. DLDI auto-patching
• Savegame autodetect and autogeneration
• Operates in either FAT or FAT32 file system which is recognised by all PCs
• Action replay cheat edit capability
• Energy saving design which saves battery life
• User orientated interface which is customizable.
• Supports SOFTRESET 
• Supports Wifi, DS Rumble Pak and DS browser
• Supports Download playability