Hi Nophster,
1: Although sanding sticks may give you more control, I usually just use "wet and dry" papers. You can get these from a hardware store or auto parts store for a dollar or two per sheet. 400, 800, 1200 grits. Also, you can get the equivalent of "sanding sticks" from anywhere that sells cosmetics - those foam-cored fingernail buffing sticks are essentially the same thing.
2: Craft wire - if you have a "dollar store" type place handy which sells beading supplies, you can find spools of thin (eg. 0.5mm) wire with a variety of coatings (eg. "copper", red, blue, black for a couple of dollars per 50m spool. For thicknesses less than that, you can strip a length of electrical wire and use the individual wires within.
3: Scribing template - Something that gives you the basic "odd" shapes - little circles, ovals - for straight lines, you can use thick plastic tape (eg. electrical tape or Dymo embossing (labelling) tape as a guide.
4: Decal setting solutions - You can get the old "standards" Microscale Micro-Sol and Micro-Set or as an alternative, white vinegar is also said to work.
Not everything we use has to come from a hobby store.