Oooo I love Michaels
If you don't have them yet then I would suggest rather than just the 000 and 001 that you look for a set of nylon (white or red) small brushes. Sometimes you can find sets that have varying sizes and widths for a better price than individual brushes. Also - don't be afraid to buy the "craft" type brushes - the ones they display with Tole Painting things for instance are just as good for these purposes as expensive "artisits" brushes.
You are going to want some acrylic medium if you don't already have it. I recommend both glossy and flat/matte types. There are uses for both, and I have found that I actually like the sheen I get from one layer of glossy covered by a layer of matte. That seems to approximate the shine of Playmo plastic better than just one or the other. The medium is used put on over the top of your final paint coat - it dries clear - but be aware that it can lift up color that isn't fully dry - or color from an ink jet printer.
Paints - I have expensive artist acrylics that I use, but I also use the less expensive craft paints. If you are interested in acrylics check out the racks for Windsor & Newton or Shiva artista acrylics for unusual or specialty colors. The gold I used on my nobleman is fantastic and matches Playmo gold very well - it is a Windsor color I believe. Also check the craft paints for basic colors including black and white. There are some fun craft paints such as glitter, irridescent, and glow in the dark also. All of this applies to acrylics only - you will have a harder time finding enamels there - though there should be some.
X-acto knives - they carry them and if you don't already have an assortment I recommend you look at them. Of particular use to me are the finer chisel point flats for cutting out printed designs to applique on, and the small saw blades. They have a larger saw blade and Mitre box that I have used for bigger things, but they also make small saw blades that fit in a standard x-acto knife handle that are great for cutting smaller items. (also good for detail work on jack-o-lanterns)
Paper - check out the artist papers for colors you like. I use the large sheet artist paper in a mid-dark grey for the background of all my photos for Animobil. I find it works better than white or black since the contrast doesn't mess with the digital camera's light sensor so much and I get more accurate color with less fixing needed afterwards.
They carry a zillion different specialty papers for scrapbooking. Look for ones that would make nice backgrounds or wallpaper for structures.
Beads - there is a big bead section - you might take a look if the Simon42 style has ever appealed to you.
There are also more obscure things like gold leaf available.
Just a few things off the top of my head.
