I always put it in this order (for hobby monies, anyhow)-
1. Kit. If it's on clearance, and I want it, I will get it.
2. Primer.
3. Styrene sheet and rods
4.New x-acto blades
5. Kit. If it's expensive, I will get other things instead first.
Normally, I rely on trades for kits. You know this well, DC!