Comgateway already offer a repack service, I suspect others may well do also. US$7 to repack or US$5 for regular (Prime) customers.
What are they like compared to Youshop or shipito?
From what I have seen so far, slightly more expensive for small parcels ($5 to $10) but similar around the 7kg mark and up. Much faster processing on parcels and real tracking via DHL. I swapped from Shipito to Comgateway but I cant remember why sorry.