Prismatic LFP battery cells are widly use for solar energy storage systems. and also small home energy storage.
Mostly, small capacity like 20Ah, 50Ah can used for EV and golfcart. Here is a list from CMX. They has a wide range of lifepo4 prismatic cells in stock. Bulk quantity for wholesale price.
https://cmxbattery.com/battery-chemistry/large-square-prismatic-lithium-ion-battery-rechargeable-lifepo4-cellscmx/
Large square Prismatic Lithium Ion Battery & rechargeable lifepo4 cells
A prismatic lithium ion battery normally produced by a Steel or aluminum casing, and Some of Big Lithium ion battery with an ABS casing. This type of Square lithium ion battery is normally an old production. The battery casing purpose to increases the stability of battery cells. In turn, this unique design tends to make prismatic cells thin and light, and also with the feature of space saving. A rectangular shape of thin prismatic cells offers better layering than cylindrical cells. It gives more flexibility for battery design engineers. The popularity of prismatic cells is also related to their large capacity. For example, a compact 12V battery pack could be easily created by connecting four prismatic cells together. Therefore, prismatic cells are commonly used in large power applications such as Battery energy storage systems and also electronic cars.