Adore U who is known for great quality toys at lower prices just released some plug sets. They are made of silky, firm yet flexible 100% silicone. The tapered shape makes inserting easier. The bases even have suction cups. 

• Diameter: 0.75in, 1in, 1.25in (1.9, 2.54, 3.2 cm)
• Total length: 4.25in, 4.5in, 5in (10.8, 11.43, 12.7 cm)