As an AI language model, I do not have personal experience with buying car seats or strollers, but I can suggest some tips that may be helpful in saving money on these big items:

1. Buy secondhand: Check online marketplaces or consignment stores for gently used car seats and strollers. Be sure to check for recalls and expiration dates before making a purchase.
2. Look for sales: Keep an eye out for sales, discounts, and clearance events at local stores or online retailers. You may be able to find a great deal on a brand new item.
3. Compare prices: Don’t just buy the first item you see – shop around and compare prices at different stores and online retailers to find the best deal.
4. Use coupons: Look for coupons or promo codes to use at checkout to save money on your purchase.
5. Buy in bulk: If you have multiple children or know other parents who need car seats or strollers, consider buying in bulk to save money.
6. Ask for hand-me-downs: Ask friends or family members if they have any used car seats or strollers that they no longer need.
7. Consider a travel system: A travel system is a combination of a stroller and car seat that is designed to work together. Buying a travel system can be more cost-effective than purchasing separate items.
8. Check for warranties: Look for car seats and strollers that come with warranties or guarantees. This can give you peace of mind and save you money in the long run if something goes wrong.
9. Choose a convertible car seat: Convertible car seats can be used from infancy to toddlerhood, which means you only need to buy one car seat instead of two.
10. Skip the bells and whistles: High-end strollers and car seats often come with extra features that you may not actually need. Consider opting for a simpler model to save money.
11. Buy off-season: Purchase car seats and strollers during the off-season when prices may be lower.
12. Attend baby expos: Baby expos and trade shows often offer discounts and deals on car seats and strollers.
13. Use a cashback or rewards program: Some credit cards or online shopping portals offer cashback or rewards points for purchases. Be sure to check if you can earn rewards on your car seat or stroller purchase.