I normally recommend Nikon-branded parts and accessories. there are exceptions though.
I tested and reviewed this one from BestBatt and found that it works properly.
I can't offer an opinion on the quality of the unit's internal parts, and I can't comment on the quality of the plastic shell or on what sort of minor banging around it will tolerate compared to the tough units made by/supplied to Nikon, but it did a perfectly good job as a charger sitting on a desktop. No battery problems, no undercharging, no overcharging. We unplugged the unit, deliberately pushed it off a desktop onto a hardwood floor which dislodged something inside the unit that caused it to stop working.
The Expendables: comes with a bonus car charger; BestBatt is pretty good about exhanges during the very short warranty period for these sorts of devices.
The Party at Kitty & Stud's: it's a wall wart-style device; no AC cord; not quite up to Nikon's construction quality.
This one, sold through DigiAccessories is another story. It's cheap, three of them failed (in a row) after anywhere from two to four charging sessions. On one of the test units, the flip-out AC, two-prong connector simply fell off when we reconnected the unit to do a third charging session. We unplugged a unit, deliberately pushed it off a desktop onto a hardwood floor which caused the unit to pop open like a pinata smacked by Chris Davis.
Die Hard: you can get one for five bucks.
Hudson Hawk: the bonus car charger fits so tightly into the accessory outlet that you're liable to break the thing; none of the test units were still working after the fourth charging sessions; the flip-out AC connector can easily break; it's a wall wart-style device so there's no AC cord.
The OEM Nikon MH-25 is tough, reliable, withstands accidental falls off a desktop, comes with an AC cord, and is fully warranted by Nikon. Best price I've seen for a real MH-25 is the same price you found already - $46.95.