Hi Muzhi,
Thanks for your consultation with the price for our filaments, 10 rolls of PLA black price is 80.25$ on our website during new year activites, this is product link:https://www.geeetech.com/10kgpla-black-3d-printer-filam-
ent-175mm-1kgroll-p-1484.html.
If you have any problems you can contact me by this mailbox:myorder@geeetech.com,have a nice day .