Ebay offers Skip Hop All Season Car Seat Cover for $14 (reg $400 with free shipping.

Product Description:
Be prepared for whatever the weather brings while heading out with baby—our All Seasons Baby Car Seat Cover has you covered. Designed to adapt for all-year comfort—from chilly days to summer heat, the machine washable car seat cover features a cozy fleece flap for winter that zips off for warmer springtime weather. When temperatures soar in summer, use the attached sunshade (hidden in a handy tuck-away pocket). It features UPF40+ sun protection, a breathable mesh inset and elastic edges that stretch to fit snugly on your carrier. Come fall, the water-repellent exterior fabric helps protect baby, while the fleece flap can be rolled up or down depending on your needs.

• Dimensions (Overall): 27 Inches (H) x 16 Inches (W) x 3 Inches (D)
• Weight: .69 Pounds
• Suggested Age: 3-6 Months
• Industry or Government Certifications: No Certifications
• Material: Polyester
• Battery: No Battery Used
• Care & Cleaning: Do Not Bleach, Machine Wash