a pistol from halo can be easy to make if you follow this for under 20$ !!!
foam is another option
Step 1: You Will Need
proper scale template
Step 2: Cutting to Perfection
cutout the white template then trace it on some cardboard then cut the card board out. repeat this cycle until you have about 5 cutouts.
Step 3: Glue
glue all pieces together.
Step 4: Painting
you can paint it gold or any real color you want but if you want the proper colors follow this picture
Step 5: Done
you can now use this weapon for anything! Movies, Cosplay, comic con, Halloween and much much more!