I believe this is the easiest and cheapest garden bench you could possibly make. At Woodward Acres, we made 2 of these and this video walks you through us making the second one.
Your shopping list is basically 3 boards.
1 - 2x8x10"
1 - 2x6x8"
1 - 2x10x8'
and then some lag bolts. I put three 1/2 x 4" lags on each side so for one bench you would need 6 and for two benches you would need 12 total.
Now one thing I did differently is because the 2x6 and 2x10 are actually enough wood for 2 benches I added a second 2x8 to the shopping cart and then I had enough wood for both benches.
If we can do it we believe you can do it. In the video I broke down prices too so if you live near Home Depot, Lowes and Menards I show you which one is cheaper.
Enjoy!
-Shawn