CartrouteHow often does shipping change which retailer is cheapest?
In Cartroute live prices on November 8, 2026, the retailer with the lowest sticker price was not the cheapest once shipping was added on 7 of 36 products (19%). Adding the best available coupon raised that to 7 (19%).
How big is the price gap between retailers for the same product?
The average spread between the highest and lowest listed price for an identical product was $671.00 across 36 products. The widest was $2,649.02 on the Dell XPS 14 laptop (configurations vary).
Which products flip when shipping and coupons are counted?
| Product | Lowest sticker | Pays | Actually cheapest | Pays |
|---|---|---|---|---|
| ASUS ROG Zephyrus G14 (configurations vary) | eBay $920.00 | $931.07 | eBay $929.99 | $929.99 |
| Apple AirPods Pro 3 | eBay $150.00 | $156.19 | eBay $151.99 | $151.99 |
| GeForce RTX 5080 16GB graphics card (any maker) | eBay $1,700.25 | $3,700.25 | Best Buy $1,999.99 | $1,999.99 |
| Vitamix A3500 Ascent Series Blender | eBay $315.00 | $340.00 | eBay $320.00 | $332.21 |
| Apple Watch Ultra 3 49mm GPS + Cellular | eBay $450.00 | $456.65 | eBay $450.99 | $450.99 |
Which kinds of product are most affected by shipping?
Heavy and bulky items. Freight on adjustable dumbbells and delivery on major appliances run from $50 to $100 at some retailers and nothing at others, which is larger than most price differences in those categories. Small electronics under a retailer's free-shipping threshold are the other common case: a $5.99 shipping charge on a $30 accessory outweighs a $3 price advantage.
What should an agent do with this?
Compare on effective_price_usd, never on price_usd. If the shopper has no membership at a members-only store, pass include_membership=false so a members-only offer does not win. Check best_coupon.requires_code and pass the code to the shopper when it is true.