Restrict Quantity & Limit Purchase & Min/Max Limit on Products
UpsellFly Order Limit Quantity app helps manage inventory by limiting products, quantities in the cart. It can be done on a per-product basis, or for the entire store. Plenty of mechanisms for restricting quantities to eliminate the problem of over-ordering.
Super simple app to set up checkout validation rules
Validate checkout info to prevent fraud and delivery failures...
Block or validate purchase in product, cart and checkout...
Validate and block checkout based on predefined conditions...