Released last week was the Raspberry Pi 3 Model A+ as their latest ARM SBC coming in at the $25 USD price point and their last board release before doing a redesign. I was able to snag a Raspberry Pi 3 Model A+ for $25 with availability appearing to be better than some of the past Raspberry Pi releases. Here are some initial benchmarks of the RPi 3 Model A Plus compared to a few other ARM boards.
The Raspberry Pi 3 Model A+ uses a Broadcom BCM2837B0 SoC just like the Raspberry Pi 3 Model B+ at $35. That SoC allows for four Cortex-A53 cores running at 1.4GHz, so in CPU tests the performance is quite close between the boards. But the $25 Model A 3+ board only has 512MB of RAM (which is shared with the GPU, like the other Raspberry Pis) compared to 1GB on the more common Raspberry Pi 3 Model B+.