I looked at the spruce tree sellers on eBay and they don’t have sprues from this kit.
A really long shot might be contacting Miniart directly, or one of the Ukraine based resellers
I checked the usual Ebay sellers as well and no luck.
I also contacted Miniart and also no luck. This is the reply I got from them,
Thank you for contacting us.
We do not have the opportunity to sell Sprues/Decals/PE separately from our kits, we sell our products to Distributors
and they distribute them to Hobby Shops. But if you have faced any issues during the assembling process, please let us know.
Best regards,
Customer Service MiniArt