Suggest you sell them on ebay. There are no restrictions in 49 states for selling insulin syringes, Delaware being the only state that requires a prescription. To avoid any legal problems you should probably state that these can NOT be sold to a Delaware state resident to avoid any legal problems.
Of course you could also list them on Craig’s List, but that can get complicated since it’s only local and you would need to meet them to deliver, which may have it’s own, possibly extreme risks.
60 years as a Type 1