With concrete you will have other factors to consider, footing, deadmen/tiebacks, hydraulic pressure and weep holes, joints and the inevitable cracking.
Do the blocks Kevin, all you need is a good sand bed that is compacted and level. The blocks setback so for a 2 ft height tiebacks/deadmen aren't necessary, hydraulic pressure / water will weep naturally through the cracks and cracking will not be an issue.
When we did the BIL's wall it was about 4ft tall and 30ft long. On the 6th course we sandwiched plastic fencing in between the blocks and buried it into the slope for a tieback. A dab of polyurethane adhesive on the cap blocks to make sure they stayed put.
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Grey concrete that is then stained can/would be cheaper, but as Bert called out, it is a different kind of animal from a whole project aspect. I explored the idea of a dry poured wall, with rock/stone outlines cut into it, but with the deal I got on the blocks, it was a no brainer.
The block route is pretty painless, and leaves a nicely finished face.
Almost done with the base layer.
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Base layer is finished. Now to backfill and wait for the rest of my block to be delivered.
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How tall are you going to build? Are you just waiting for caps at this point?
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Approximately 4'. I'm currently waiting for Home Depot to get their crap together and deliver the remainder of my order consisting of 160 more blocks which will add two more rows to what I currently have. Then we'll assess if I need another row. After that, backfill, lay down fill dirt, weed mat, rock, then cap the blocks. Plus build a gate.
You should really consider building me one as well. It would be hard work and I would pay very poorly. It would be fun.