Where can I download iOS 8.x firmware / IPSW files for the iPhone 5c?

The iPhone 5c is basically iPhone 5 hardware in a bright plastic case. It shares internal parts such as the A6 processor and 4-inch Retina display. The device originally shipped with iOS 7 installed. Here are links to the official iOS 8 IPSW files for the iPhone 5c:

iPhone 5c (AT&T / GSM) iOS 8.1.1: iPhone5,3_8.1.1_12B435_Restore.ipsw
iPhone 5c (GSM & CDMA) iOS 8.1.1: iPhone5,4_8.1.1_12B435_Restore.ipsw

iPhone 5c (AT&T / GSM) iOS 8.1.0: iPhone5,3_8.1_12B411_Restore.ipsw
iPhone 5c (GSM & CDMA) iOS 8.1.0: iPhone5,4_8.1_12B411_Restore.ipsw

iPhone 5c (AT&T / GSM) iOS 8.0.1: iPhone5,3_8.0.1_12A402_Restore.ipsw
iPhone 5c (GSM & CDMA) iOS 8.0.1: iPhone5,4_8.0.1_12A402_Restore.ipsw

iPhone 5c (AT&T / GSM) iOS 8.0.0: iPhone5,3_8.0_12A365_Restore.ipsw
iPhone 5c (GSM & CDMA) iOS 8.0.0: iPhone5,4_8.0_12A365_Restore.ipsw