Out of the 35 colours, only the following four are more expensive on Craftsy.
1. Yellow Ochre
2. Quinacridone Magenta
3. Quinacridone Gold
4. Neutral Tint
My personal recommendation would be
Hansa Yellow Medium
Quinacridone Burnt Scarlet
Permanent Alizarin Crimson
French Ultramarine
Phthalo Blue (Green Shade)
Cerulean Blue
Phthalo Green (Blue Shade)
Sap Green
Burnt Sienna
Neutral Tint
If you want to check out the whole range of supplies they are selling, it's at https://goo.gl/CFVENJ