Walmart had many of their Kustom Color (Valspar) enamel model paints for $1.00.
Sets of 6 colors and a 2/0 brush for $9.00. Military, Metals, Transparents.
There are colors in the sets not available separately.
1/8. 0, 2/0, 3/0 brushes $1.00
Spray cans were $3.00
A big YMMV. Only 2 of the six Walmarts had these.