sorry for the necro, but I thought it would be a good idea to get this out now, don't by from DJTransformer. The guy is notorious in the chipmusic scene for being hella unreliable, I seem to be the only person who's ever bought from him, who hasn't had any problems. He's been unreliable since around 2011, if not earlier (original complaint thread was on a different forum that's now down for good) and he's said recently that he's thinking of closing up shop entirely.
Never ordered from HKEMS, if I need EMS carts, I go to kitsch, but it would be a way better idea to buy it through their site, rather than a third part vendor, especially one with a reputation like his.
Also, it's probably going to be your cheapest option to get a transferer II than anything else. I mean if you've got a 64mb EMS, or similer (usb bleepbloop, drag 'n' derp etc) flash cart that you can connect to your PC through usb or whatever, then you might want to get a mega memory card. Use it to transfer data from [insert game here] to the mega memory cart, then from the cart to [insert usb flashcart here]