Amazon has 2-Pack Pre-Filled Tomcat Mouse Killer Disposable Ready-To-Use Bait Stations on sale for $3.90. Shipping is free w/ Prime or on $35+ orders.

Features:

• Tomcat Mouse Killer Child Resistant, Disposable Station is a bait station pre-filled with one poison block that kills up to 12 mice (based on no-choice laboratory testing)
• Mouse bait station is resistant to tampering by children
• The bait station features a clear lid for easy bait monitoring, and can be disposed of once mouse activity comes to an end