Scroll down the page to compare Arduino Proto Shields at different stores and find the best price.
The prototyping shield provides an easy way to build and design your own circuits. You can solder the parts in the prototyping area, resulting in a clean and neat circuit that you can easily mount and detach from the Arduino. Alternatively, if you don’t like to solder or don’t want to stick to such a permanent solution, you can mount your circuit on the tiny breadboard that comes with the shields.
eBay - Proto Shield prototype expansion board for Arduino with mini breadboard
$2.48
eBay
Banggood - Proto Shield prototype expansion board for Arduino with mini breadboard
$3.50
Banggood.com
Aliexpress - Proto Shield prototype expansion board for Arduino with mini breadboard
Aliexpress
Frentaly UNO Proto Shield Prototype Expansion Board with SYB-170 Mini Breadboard Based for Arduino UNO ProtoShield
Amazon.com