Since the de minimis exemption was abolished four months ago, the number of parcels coming to the U.S. worth less than $800 has fallen by 54%.
Attempts to be transparent about pricing can potentially be seen as political.
Shein and Temu are among those that have hiked prices.
The fast fashion retailer declared bankruptcy this week, for the second time in six years.
Analysts say this could be a bid for the retailer to compete more directly with ultra-low-cost sites like Temu and Shein.
