Here are the specs for your Mac: https://everymac.com/systems/apple/imac/specs/imac-core-i5-2.9-21-inch-aluminum-late-2013-specs.html
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Given that you are looking for a "cheap" one on Amazon, I'm going to assume you are not looking to replace with a Fusion Drive.
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Given that you are looking for a "cheap" one on Amazon, I'm going to assume you are not looking to replace a Fusion Drive setup.
Essentially, you want a 2.5" drive with a SATA III 6 Gb/s connection. So you can search wherever you want for the best deal. I've provided a couple of examples below.
Cheap Option: For a regular 250GB HDD: https://www.amazon.com/250GB-Inchs-Drive-Laptop-Notebook/dp/B0087HHBXM/ref=sr_1_4?ie=UTF8&qid=1524152275&sr=8-4&keywords=Serial+ATA+2.5+hard+drive&dpID=41Ubd%252BwmxyL&preST=_SY300_QL70_&dpSrc=srch
Performance Option: If you want to spend a little more money for a 250GB SSD (recommended): https://www.amazon.com/dp/B0764WCXCV/ref=psdc_1292116011_t1_B01IAGSD5O
Use this iFixit Repair Guide to help with the replacement: [guide|28781]
Here are the specs for your Mac: https://everymac.com/systems/apple/imac/specs/imac-core-i5-2.9-21-inch-aluminum-late-2013-specs.html
Given that you are looking for a "cheap" one on Amazon, I'm going to assume you are not looking to replace with a Fusion Drive.
Essentially, you want a 2.5" drive with a SATA III 6 Gb/s connection. So you can search wherever you want for the best deal. I've provided a couple of examples below.
Cheap Option: For a regular 250GB HDD: https://www.amazon.com/250GB-Inchs-Drive-Laptop-Notebook/dp/B0087HHBXM/ref=sr_1_4?ie=UTF8&qid=1524152275&sr=8-4&keywords=Serial+ATA+2.5+hard+drive&dpID=41Ubd%252BwmxyL&preST=_SY300_QL70_&dpSrc=srch
Performance Option: If you want to spend a little more money for a 250GB SSD (recommended): https://www.amazon.com/dp/B0764WCXCV/ref=psdc_1292116011_t1_B01IAGSD5O
Use this iFixit Repair Guide to help with the replacement: [guide|28781]