Some strategies from HGTV.com for successful garage shopping:
Take clothing measurements of those for whom you’re buying ahead of time. Carry a list of sleeve lengths, inseams, neck, chest and waist sizes, and pack a cloth measuring tape to see if items are likely to fit.
Arrive early to get the best selection.
Make a game plan for the time you want to spend shopping at garage sales. Check out the garage sale listings in the classified ads section of your newspaper, then locate and focus on one central area.
Bring some snacks and a bottle of water to keep your energy up and to stay hydrated.
Carry money in small bills, especially at the beginning of the day.
Make a few passes through the sale before making any purchases or leaving. Sometimes something desirable will go overlooked on the first pass.
Open up board games or puzzles to make sure that either all of the pieces are included, or that there are at least enough there to play the game.
When buying electrically powered items, ask to plug them in to ensure they work before purchasing.
Don’t be afraid to haggle.