These are Space Invaders Sprite badges, which I have created using Perler Beads (melted plastic beads). Here are several different invaders, a player, and a saucer.
I am selling these badges for wear at this year's Megaplex: Retro Arcade! $5 for the saucer, $4 for the player, and $3 for each invader. This is available for preorder, which will be delivered to Megaplex. If you are not able to attend, add $2, and I'll mail it to you in the US. Payments by Paypal is most prefered.