You can try a reputable estate sale company. You can consign your items with someone or even an antique/collectors store, but if it's a single person it needs to be someone you trust and know personally. I would recommend trying flea markets, reputable shops, or selling yourself first, you will make more money. IF you go to pawn shops or antique stores, please do your homework so you know the value of your items. If they are highly valuable, you can even take out an insurance, in the event of theft or loss while under consignment.
