Where to find gacha in Sapporo
Central Sapporo has a surprising number of gacha shops, most of them within walking distance of each other between Odori Park and Susukino. In winter you can do the whole route under cover.
Tanukikoji and Susukino
Tanukikoji, the long covered shopping street south of Odori, has several #C-pla shops along its blocks. The NORBESA building in Susukino has a Gashapon Department Store and a Gashapon Bandai Official Shop, and there are arcades around the Susukino crossing.
Around Sapporo Station
The department stores and malls by the station have more gacha shops, including a Gashapon Department Store, and there are arcades nearby.
New Chitose Airport
New Chitose Airport has a Gashapon Bandai Official Shop in the domestic terminal, good for a last look before you fly. See gacha at Japanese airports.