I'll admit, the A110 is instantly less attractive at $229 when you can now get a 32GB Nexus 7 for $250. But still, if you want HDMI out and absolutely must have expandable storage in a 7" form factor, then the A110 is the only clear choice that won't break the bank.
Aside from the aforementioned microSD card slot and microHDMI out, the A110 offers the quad-core Tegra 3 processor, 1GB RAM, 8GB storage, microUSB, and Android 4.1. Not the best deal on the market by any means, but it's not the biggest rip-off you'll find in the Android tablet world, either.
If this little guy is calling your name, you can buy it now from a variety of retailers, including Amazon. I would stay away from Best Buy, though - for some reason, it has the device priced at $250. No, Best Buy. Just no.