I'm looking for a low budget current sensors for AC
Consider isolated in-line current sensors such as the Allegro Micro ACS712:

These current sensors work with AC or DC, and add just 1.2 milliOhms to the current path. Line isolation is 2.1 kV RMS, so your circuitry on the sensing side is safe from line voltages. There are 5 Ampere, 20 Ampere and 30 Ampere versions of the IC.

The device is also available as prebuilt modules on eBay ($2.98 shipped), for a much lower price than single units of the bare IC on DigiKey ($4.34 + shipping).