10 PCS DS1338Z-33+ SOP-8 DS133833 I2C RTC with 56-Byte NV RAM new | eBay
Buy MY TechnoCare - Means Your Care DS1307 RTC Module For Arduino, 8051, AVR, Pic, Arm, Msp430, Raspberry Pi Board I2C Iic Real Time Clock Kit With Li Battery, 56 Byte NV
Maxim DS1307ZN+, Real Time Clock (RTC), 56B RAM Serial-I2C, 8-Pin SOIC - Listec Holdings Pvt Ltd