Here's what sold/didn't sell:
1) CDs and DVDs sold easily once they were marked down to $1
2) Everybody was really interested in jewelry, which was strange and unfortunate because my goal was to free up cubic feet of space. Jewelry doesn't take up much space. But at least it drew people in.
3) Cables - power cables, ethernet, unidentified ones, gradually sold for a quarter and then some guy finally bought the whole heavy big box for $5.
4) Large baby items were tougher to get rid of than I thought. Especially if it was PINK. One more reason why I'm going to keep telling people to buy gender-neutral items... someday, you will be trying to get this crap out of your house. And not every pregnant woman knows if she's having a boy or a girl yet. We bought gender-neutral stuff but the gifts I was given when pregnant with a girl were every shade of pepto-bismol.
5) I did not even try to sell clothes, those are too easy to bag up and donate so I'm always getting rid of them. Did have some shoes out though, and oddly enough people bought my shoes for $1 a pair.
6) Our tent with a broken zipper went for $5 at the very end.
7) I noted in my craigslist ad that we had a futon, and that drew buyers out to claim it. Otherwise it would not have sold.
8) Dishes and other kitchen items did not sell.
9) Toys did not sell - although I gave some away to cute little kids. I think I'm going to start taking Josie to garage sales, because when a kid says "Can I have this?" it's hard to say no! Oh, Josie even made $1 when she sold someone her autograph. I'm not kidding. She wrote her name in marker on CD envelopes and told me she "made these to sell!" and I rolled my eyes and then sure enough, ten minutes later she's working a transaction with some smiling lady who thought the whole offer was hilarious.
10) When it comes to prices, every individual shopper does something totally different. I was more than willing to bargain, but there were people who told me my price was too high and then they wouldn't counter-offer! And sometimes it was insane... I'd say "Okay, I'll take $3" and they'd FLINCH and be like "whoh, way too high" and just walk off. $3? Isn't that an amount of money that could blow down the street out of your hand and you wouldn't chase it? You're saying we can't even START bargaining from there?
Back to big stuff... The worst thing about our garage sale is that with rain in the forecast, we weren't sure if we were even going to have it until the day before. I think my official "best practice" would be to have a craigslist notice out 3-5 days before the sale listing all the big stuff.
We still have a 19" CRT television that we marked FREE and no one took it, and DAV wouldn't take it for a donation, so I don't know where that can go. You're not allowed to throw them away. Hell.
Oh, and I refused to hold anything for anyone, but did give out my phone number and told people they could text me and I'd verify whether we still had items available.
I think we made about $200. And we freed up a TON of space in the basement, between the sale and the final carload of donations which we can also write off.
I call it a success!