I love Shopping Mall Japan. As of today I've done 46 successful transactions with them, never once had a problem. Being able to bid on your own in real time is just amazing. No waiting for another person to bid and you can literally have "bid wars" with other people if you need to, right up to the last minute.
Plus they're actually cheaper than Jerold (according to the prices raynebc listed). SMJ's current price breakdown for that exact 1,800 yen auction would be:
1,800 yen final auction price = $21.57
Commission = $6.00
Wire fee = $3.00
Internal shipping (it varies as jb said, but I find it's usually between 300-600 yen, so let's take the average, 450 yen) = $5.39 (This price INCLUDES Japan->US shipping)
US->US shipping (their US warehouse to your US home address), I usually do Media Mail, which for this auction would be $2.50
Total: $38.46
Jerold's total from raynebc's post: 3,619 yen = $43.38
So you'd save $4.92 by going with SMJ on this particular auction AND you get to do the bidding yourself, in real time. However, as jb said, SMJ does require a deposit.. but it doesn't work exactly how he explained. What you do is deposit any amount of money (let's say $20) via PayPal. They will multiply that amount by 5, giving you a bidding limit of $100. Think of it as a security deposit. I deposited $40 back in 2007 and I've done just fine with a $200 limit. Plus, if I ever need to, I can put that $40 toward an auction and then just re-deposit in the future.