20 X TI NE555 555 Timer IC Integrated Circuit Chip DIP-8 SA555 SE555 SE555C USA | eBay
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
Enginursday: On the 555 Timer - News - SparkFun Electronics