Scroll down the page to compare the IR Receiver price at different stores. TSOP4838 – IR Receiver module that operates at frequency of 38KHz. You can supply voltage between 2.7V and 5.5V.
eBay - IR Receiver - 38KHz TSOP4838
$1.08
eBay
eBay - 5pcs IR Receiver - 38KHz TSOP4838
$1.89
eBay
Banggood - 5pcs IR Receiver - 38KHz TSOP4838
$10.99
Banggood.com
Amazon.com - IR Receiver - 38KHz TSOP4838
Amazon.com
Amazon.de - 1pcs IR Receiver - 38KHz TSOP4838
Amazon.de
Amazon.es - 5pcs IR Receiver - 38KHz TSOP4838
Amazon.es
Amazon.co.uk - 2pcs IR Receiver - 38KHz TSOP4838
Amazon.co.uk
Aliexpress - 2pcs IR Receiver - 38KHz TSOP4838
$0.72
Aliexpress