TLC551 IC Timer - CMOS 555 with 1V to 15V power, up to 1.8MHz [TLC551CP] : ID 5222 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
10pcs NE555P NE555 IC 555 High Precision Oscillator Timer DIP-8 Chip USA | eBay
555 Timer IC PIN Diagram, Working, Features & Uses