I understand not wanting to spend $200-$250 on a Nexus 7 / Galaxy Tab 2. But seriously.
If you want a $100 Android tablet, pick up a used/refurb Nook color. With CM7 on it (and CM9/10 still in the works) it's a lot better with its pretty IPS screen than these cheap POS tablets. Along with solid hardware and a great homebrew ROM community for it.
They go on sale all of the time on cowboom or ebay or whatever for $100-$120.
Yea, still rocking on my HP Touchpad on cm9 for $99.
IMO, Go either nexgen (tegra3, 1920x1080+, ipad3) or get a used 10" off Ebay or Cowboom.
I managed to snag a few really good tablets off cowboom on grade 7 and 8's using this Cowboom Grade Tracker site that's constantly crawling them. I just look for 7's and 8's + price, and the items I got (7s,8s) I can't tell difference from new. Right now there's a whole bunch of xoom, galaxy, asus, and touchpads with 7/8 grades.