Premium thrift sources? I want to thrift a new never used dress I got from Canada. Help a girl out!!

Hi girlies! I tried using the Reddit thrift pages, but I spent about 100 Canadian dollars on this Zara dress | got from Toronto last winter which is new, never used, never worn. I guess the thrift pages won't work for high value items as I noticed people are selling things below 1k only which is fair. Any other sources where I can sell off my brand new dress? Thank you :)