Please recheck your local Home Depot, they should be back in stock.
280 if I recall correctly
The 10" Wall Block comes with 280 pieces per pallet.
You do not need adhesive but I’m sure it would help stabilize it. I made a large round planter about 2.5 feet high with no adhesive. I planted a giant bird of paradise in it. I’ve had no problems even with high winds.
I think you could. It's just concrete.
Thank you for your recent inquiry with The Home Depot regarding 3 in. x 10 in. x 6 in. Sierra Blend Concrete Retaining Wall Block. While some locations may stock this stony year round it is primarily carrier in store during the Spring/Summer months. Please check your local store for availability. We appreciate your business and look forward to serving you in the future.
From the Home Depot website the product weight for Pavestone 3 in. x 10 in. x 6 in. Sierra Blend Concrete Retaining Wall Block is 13.2 pounds each.
I tried to find matching cap blocks for this block as well and found out that they do not make them.
The 10" Retaining Wall stones come with 280 pieces on a pallet.