I just found a small treasure trove 💎of hard liquor rebates (not found on any site that I know of…) from Heaven Hill Distillery - NO it’s not going to free - but definitely offers good variety & range:
https://heavenhill.inmarrebates.com
double check their terms & conditions - some are for 750mL, 1L, & 1.75L handles, also click on their mail-in-rebate forms to triple check!