Amazon has 24oz. Natria Ready-to-Use Neem Oil Spray for Plants/Insects (706250A) on sale for $6.29. Shipping is free w/ Prime or on $35+ orders.

Features:

• Can be applied in the spring; early summer or fall; and it can be used up to the day of harvest
• Can be used on a variety of indoor and outdoor plants
• Works on aphids; spider mites; whiteflies; caterpillars; fruit flies; midges; beetles; and more
• Helps control blackspot; botrytis; downy mildew; powdery mildew; scab; rust and more