cards with r4isdhc.com on the sticker (OP) are BAD. even if they work, they will timebomb unless you replace with ysmenu, and then dsi enhanced game don't work. They are clones of...
r4i-sdhc.com. Thi is what the other guy cloned. Not Wood, but decent firmware, and work like they are supposed to as i recall.
r4ids.cn is great, and has official Wood firmware, and is the ONLY Wood cart with RTS. Wood Goblin supports this cart, along with original r4 and original Acekard RPG. 1.64 is developed by them, and has RTS function in it, with Wood's blessing. Best sub 20$ DS cart.
r4isdhc.com.cn runs hacked Wood, has no timebomb, no RTS, but does work alright. every function works as advertised. best sub 10$ ds cart.
Ace3ds+ is about as cheap, and seems to run the exact same firmware as above (but uses different encryption on said firmware).
I can't speak for any other carts.