Old El Paso mini stand and stuff taco kits with sauce and spice mix for $1. RRP $6.99, even on half price at Wollies for $3.49 now so still represents a great price.
The only catch is that the use by date is tomorrow but given these kits can't tell the time it should be good for a month or two to come. So if you want to make some mexican in the next few days / weeks, this is a great bargain.
That's even cheaper than buying the taco seasoning on its own