nesdev.org

Are there any products out there similar to the NES/SNES PowerPak for the Turbografx 16?

I know of the PC-E Flash Cart by NEOTEAM and Tototek also makes one, but they don't take SD Cards, and look pretty clunky. Can't find any recent information on them either, so I don't know if they're still being made or updated.

Why would you want SD over CF? And as for a TG16 flashcart, I don't know of any myself...

actually, I don't really have a preference. Any solution that takes some kind of memory card is fine. I figure sd or mini-sd cards would be best since they'd fit the HuCard better.

I don't think any such cart exists.

The Neoflash PC-E carts are still being sold. ToToTek still has their PC-E cart on their site, but it's marked as "sold out". The ToToTek cart has the advantage of being cheap, while the Neoflash cart has the advantage of not requiring a parallel port.