Is it possible to set an inventory buffer for SuiteCommerce? For example: I have 200 units of an item in stock but I don't want them all being sold. I would like to only show that I have 150 available and show it out of stock when it reaches 50.

Check the Inventory Display extension. Ref. https://netsuite.custhelp.com/app/answers/detail/a_id/82959