You’ve got a few easy options at Walmart.

• Shop online: Search for “styrofoam blocks,” “craft foam,” or “polystyrene foam” on Walmart.com or in the Walmart app. You can filter by size, shape (blocks, cubes, sheets, discs), and pack quantity.
• Choose how you get it: Many items offer shipping, delivery, or curbside pickup. Availability can vary by location.
• Check local stores: Use the online store finder or “Check availability” to see what’s in stock nearby, typically in the Arts & Crafts or Floral supplies section.
• Tip: Review dimensions and pack counts on the product page so you get the right amount for your project.

Styrofoam blocks (often polystyrene craft foam) are lightweight, easy-to-shape materials used in a wide range of projects.

• Crafting & modeling: School dioramas, prototypes, and sculpture practice.
• Floral work: Arranging fresh or artificial stems when using the appropriate floral foam type.
• Event decor: Centerpieces, signage bases, and themed displays.
• DIY & props: Costume accents, mock-ups, and hobby builds.

They come in blocks, cubes, sheets, cylinders, and discs, typically in white or green. Floral foam options may be designed for fresh (water-absorbing) or faux (dry) arrangements, while general craft foam works well for carving, painting, and gluing. Avoid high heat and heavy loads, as this material is intended for crafts and decor.

Start with your project’s dimensions and how you plan to use the foam.

1. Measure your space: Note length, width, and height to match listed product dimensions.
2. Choose a shape: Rectangles are versatile bases, cubes suit stacked displays, sheets make great backdrops, and cylinders/discs work for round designs.
3. Think thickness: Taller or heavier builds may benefit from thicker blocks for stability.
4. Plan quantity: Multipacks can be helpful for classrooms, events, or repeating elements.
5. Confirm details: Double-check dimensions and photos to visualize scale before purchase.

You can trim larger pieces to fit if needed. Selecting a size that’s slightly larger than your final design can provide room for shaping and fine-tuning.

Many water-based adhesives and paints are foam-friendly, but it’s a good idea to test first on a small area.

• Adhesives: White/PVA or tacky glue often works well. Low-temperature hot glue can be helpful for quick bonds. For floral projects, pins and picks are commonly used to secure stems.
• Paints: Water-based acrylic or craft paint usually applies smoothly. A water-based primer or gesso can help create a more even finish.
• Avoid: Solvent-based adhesives and many spray paints, which can melt or pit polystyrene foam.

Apply thin coats, allow adequate drying time, and build up coverage gradually. Results can vary by brand and technique, so small tests can help you dial in the look.

Working slowly and using the right tools can help you get clean, controlled cuts.

• Tools: A sharp craft or utility knife works for straight cuts; a fine serrated knife can help with thicker foam. Some makers use a hot-wire tool for smoother curves.
• Technique: Score lightly first, then deepen the cut with multiple passes rather than forcing it.
• Support: Use a cutting mat or scrap board, and keep the piece stable as you cut.
• Guides: A ruler helps keep lines straight; paper templates can guide curves and shapes.
• Finishing: Lightly sand edges with fine-grit sandpaper and tidy particles with a handheld vacuum.

Take your time and adjust your approach to your specific project; results may vary with tool choice and foam thickness.