Amazon has a large collection of Funko Pop! figures under $5 based on comics, movies, TV, animation and more. Shipping is free. Some popular options include:

• Star Wars: The Grand Inquisitor (pictured) for $4.18
• Captain America (Sam Wilson) with Shield for $3.56
• Ms. Marvel for $3.76
• Star Wars Jyn Erso for $3.58
• Black Adam for $4.04
• Peacemaker Judomaster for $2.78
• Luchadores Captain Marvel for $4.55
• Sinister Strange (keychain) for $4.03