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I used all my long lag screws that I salvaged from pallets I got last summer making my latest pallet wood raised bed v2.0 a few weeks ago. Now I need to buy some new lag screws or find an alternative.
At the Fleet store in town today, I found some nice Torx head 4-inch-long lag screws. But they were 79 cents each.

I use 16 long screws to put together the outside 2X4 framing of my pallet wood raised beds. That's almost $13.00 just for the initial framing if I used new Torx head lag screws. Those Torx head lag screws are really nice, strong, and don't strip out. However, I like to keep the cost of my pallet wood raised beds to a minimum.
The alternative I came up with is using 4-inch-long drywall screws with a 1/4-inch washer.
Just for the fun of it, I weighed a 4-inch-long drywall screw ($2.99 per pound) and it comes out to 6 cents per screw. The washers ($3.99 per pound) are just over 2 cents each. Our Fleet store sells these items by the pound, so they are cheaper than buying the same stuff from a big box store like Menards or Home Depot.

If you use the more expensive Torx head lag screws, you can just load them up and screw them into the wood without any problems. If you use those long drywall screws, I have found that I have to predrill a pilot hole into the wood. If not, I risk snapping off the head of the long drywall screw as it drives down into the wood. It's not a big deal, but you have to add an extra step with the predrilling with the long drywall screws or risk breaking off the head of the drywall screw causing a much longer delay.
For those not familiar with the pallet wood raised bed v2.0 I have been building, here is a picture of one I built last year. You can see the heads of the long screws in the 2X4 framing on both the top and bottom on the right side of this picture...
I finished one new pallet wood raised bed v2.0 last week. I hope to build at least one more before spring planting. Like I say, the pallet wood is free, and it only costs me about $2.00 per bed for the new screws and nails I use.
I could probably save a little more money if I reused old pallet nails I salvaged from previous breakdowns, but I like using new screws when I can and my new 18-gauge nails cost next to nothing in my brad nailer gun. Using those tools makes my final assembly go really easy and fast. And, after all, it's still less than $2.00 using new hardware on each bed.