If you're a hoarder then that makes part or all of the Prismatic Grange pretty straightforward as you (OK, me) have this just laying around. You can try these cheap items if you stashed them somewhere (easiest sources in parenthesis):
Red - Salmonberry (Spring Foraging)
Orange - Copper Ore (The Mines, floors 2-39 w/Bombs)
Yellow - Sap (chopping Trees)
Green - Fiber (Fiber Seeds, Weeds)
Blue - Blackberry (Fall Foraging)
Purple - Bug Meat (Cave Bugs; Dorado, Pike, Lingcod Fish Ponds), Iridium Ore (Statue of Perfection, Bombing Skull Cavern starting ~Level 100)