I had some I gave away last Dec, so you just missed out on a few boxes I had , buddy wanted to try using slugs to hutn deer last yr and couldn;t find any in stores, so asked me and I gave him a few boxes of these!
however, maybe just a thought for you to try??
maybe try joining some forums(if your not already) in state specific deer hunting that ONLY allow slug guns, or that's there main firearm season for deer
this would get you into maybe a higher odds game of finding someone that has some sitting at home they are not using
as there are a few states that pretty much for yrs were shotgun only like Ohio/Iowa and such
and IMO< that should increase the odds of finding them maybe for you!
a lot of guys ion these states try a lot of slugs looking for the best accuracy and tend to stop using the older one's and buying the newest and greatest one on the market!