Garage sale signs for in the garage that sell for you

Make large signs to go on large items (like furniture, mowers, washing machines, etc) listing the selling points, features, history, condition, price, etc. This will save answering a lot of the same questions all day.
Make table signs to advertise items that may be overlooked, for example, "Hand-made candles $1 each" or "Chanel Perfume - unopened - $5".
Make signs to pin on linen & clothes detailing the size, material/fabric, condition, etc. Not only will this save you being asked the same questions, it will save buyers from trying to find the tags themselves and messing up your nicely arranged display.
Make table signs describing the selling points for items on the table. These signs can either lie flat on the table or be folded in half to create a tent sign (as shown below).
If it going to be a windy day, either tape or pin your signs to the table or make a tent sign as shown below and suitable weight inside to hold it down.

Make table signs with messages that do the selling for you!
For over a dozen examples and other money-making tips, just order your copy of the Best Garage Sale Tips ebook for immediate download.

Help customers find the things they are looking for by making Section signs and keep like items together in 'departments'. This is explained more in Best garage sale layout tips. Sections could be:
Baby
Kids' Clothes
Kids' Toys
Men's Clothes
Women's Clothes
Bathroom
Kitchen
Bedroom
Books
Movies / Videos
Music
Car
Hardware
Computer
Garden
Pet Stuff
Sporting
Tools
Free Stuff
Have SOLD signs ready to put on large items that get sold but the customer needs to come back with a trailer to pick it up later in the day. Maybe include space to write:
These details would need to be included in a written receipt too.
Place OFF LIMITS signs in doorways, gates, paths. etc so customers know where they shouldn't go looking for more treasures.
Make NOT FOR SALE signs to go on objects that are in the garage or yard that people may think are for sale. This also applies to objects used to display your goods, such as tables, clothes racks, chairs you will be sitting on, pets and the children (well, let me think about that last one).
If you have decided not to accept checks, have a sign CASH ONLY.
NO RESTROOM AVAILABLE may prevent you having to refuse a request. See Best safety and security tips for more details.
To protect yourself in case a customer comes back later wanting their money back make big signs that will be positioned prominently that say:
ALL SALES
ARE FINAL

ALL ITEMS
SOLD AS IS

NO REFUNDS
WILL BE GIVEN

And of course...

NOT RESPONSIBLE
FOR ACCIDENTS
Put signs in plastic sleeves to keep them dry, sleeves are stiffer and won't blow around, won't tear way from the pins holding them up, keeps your signs re-useable and the sign inside can be easily swapped (eg from "50% off" to "Name your Price!" .
If you needed to get a permit for your garage sale, place it in a plastic sleeve and pin it up in your garage in case the authorities pay you a visit.