While ZTE is not very well known for manufacturing good Android tablets, this little guy is not so bad. The ZTE Optik has a dual-core processor, 1 GB of RAM and Android 3.2. All packed in a 7-inch form-factor.
The device looks and feels rather nice, and the specs are nothing to scoff at. It is currently available from Sprint. Sadly, though, it has no form of 4G connectivity. So you will have to go with 3G speeds if you want this affordable tablet.