Normally I will purchase a model set of a train we rode on the trip. This time it was the Kato 7 car set of the E257 Azusa / Kaiji which we had ridden early in this trip. These were available at most of the shops that I visited but found the best price by far at Hobbyland near Tokyo Station. This shop only had sets, engines, and cars and no buildings or scenery items. I got this for 10,500 yen while all of the other places I visited it was 12,000 to 14,800 yen so I was quite happy with this particular purchase.
This is the Hobbyland store near Tokyo Station where I bought my Kato Azusa / Kaiji set. This photo I pasted from Google Street View which Nona and I find very helpful in finding places in Tokyo.
I'd seen the Aoshima parking garage kit on ebay and noticed that they were in most of the hobby shops I visited. I was impressed with how large these kits are. Compare here to the stack of Green Max building boxes.