The new 10F series of PICs small and are very cheap. This is the tiny SMD version of this chip.
This chip can run on its internal 4 MHz oscillator.
manufacturer: Microchip
When this standard chip is temporarily not available I might provide you an LF chip (extended opertaing voltage range) or an E version (extended temperature range) instead. Such chips are fully (upwards) compatible replacements for the plain F chips.