Please check my "Card Shops in Japan" page before planning a trip to this store to verify that it's still where it was when I visited.
Wrappers is the third baseball card store in Jinbocho and is my favorite of them. I had originally visited this store in 2013 at their previous location in Akihabara. Their new location is in on the sixth floor of the Musashiya Building on the south eastern corner of the intersection between Yasukuni-dori and Kijibashi street just to the west of the Jinbocho subway station. It's also about a seven minute walk from Mint Kanda. Here's a photo of the building:
I had plans to meet up with Dan here on a rainy morning and ended up getting here first. Not knowing better, I went up the stairs on outside of the right side of the building. When I got to the sixth floor I was greeted by a locked door that had no markings on it. Puzzled, I went up another floor to see if I had miscounted but the store wasn't there either. I went back down the stairs to wait for Dan. When Dan arrived, he explained my mistake - there was an elevator that we needed to take up to the sixth floor. The stairs I went up were essentially the emergency exit.
In my defense, it wasn't obvious there was an elevator. Here's the entrance that you use to get to the higher floors in the building (it's the one on the left):
If you go in through this opening and turn left, you immediately see the foot of the staircase. To get to the elevator, you have to walk past the staircase into the building itself (can't remember if there's a door you have to open or not) and then turn left again and you'll see the elevator. You essentially step out into the store when you step off the elevator.
Wrappers has the most diverse inventory of any store I've been to in Japan. Beyond the usual BBM, Epoch and (at least recent) Calbee singles, you can also find singles here for more obscure issues from the turn of the century like Future Bee and DigiCube. I also found singles for this year's Buffaloes team issued set, the BBM/Nippon-Ham Home Run sausage cards from the last few years and some Glico Tigers cards from 2003-ish that I'd never seen before. Their BBM flagship singles go back to 1991 and they also have singles from most of the other BBM sets - I picked up some 1997 flagship, some 1999 Tigers team set cards and some 2004 1st Version "Asian Championship" cards here. I also picked up the final Epoch NPB card I needed here. Dan picked up some cards of Korean NPB players Dae-Ho Lee, Chang-Yong Lim and Seung-Yuop Lee here along with some Gravure Idol cards.
The store takes credit cards. Ryan says that the price for commons here is usually 50 yen so it's a good store for doing set building. They also have unopened boxes and packs and there's a couple tall display cases containing hits. Here's a couple pictures of the interior of the store (and one features Dan again):
This is among my top five favorite stores in Tokyo, if not all of Japan. Definitely worth a visit, especially if you're looking for something a little more obscure.
Here's a map showing the store's location: