Rule of thumb I’ve always heard is 10% of the new value. For example, A DVD that costs $25 retail, well yes, a used DVD store might get $10 for it, you would probably want to mark it at $4 (what pawn shops sell it for), and be willing to take $2 to $3 on average if someone offers you less. People at a garage sale are risking if them item could have some damage they don’t know about, they can’t really return it if they’re not happy with it, and they are out looking for real dirt cheap bargains…it’s the last place you can even get them these days. Bottom line, don’t overprice…if you’re not willing to get rid of it for 10 cents on the dollar give or take (unless it’s a collectable of course, but those don’t tend to do too well at garage sales either, unless the buyer knows what he’s doing and the seller does not), then don’t put it out there.
If you have large collections of things, like books, what you might want to do is advertise a start time a 1/2 hour to an hour before you go out there, because people will be scoping it out, and collectors will come by and probably take a bunch of stuff off your hands right away before the masses have at it…doesn’t always happen, but it’s worth the risk.
And be prepared to know that no matter how much stuff you sell, no mater how much money you make, you are going to end up with a lot of stuff that wasn’t sold which you are either going to have to store of give away…this is always my least favorite part.
Put the most eye catching and unusual items up front, it will draw people in. But be careful, just because it’s a big ticket item, that doesn’t make it eye catching. Colorful is perhaps more of a draw than valuable to people driving down the street, if it looks like a bunch of old junk and a ton of clothes, no one will stop…you need to have variety and it needs to be visible.
And be prepared, the things you think won’t sell are the things that will go right away, and the things you think people will fight over, no one will want…people are weird. And you will end up at the end of the day realizing that your hourly wage wasn’t all that great, but if you get rid of a sizable chunk of stuff and end up with a handful of extra (but certainly not a spectacular sum of) cash.