Alternatives to Samsung include the Hisense Sero Pro 7, which has a front and back camera, a 1280x800 ips screen, a 1.3 ghz quadcore tegra 3 processor, a microsd card slot, and sells for $149.
http://www.the-ebook-reader.com/hisense-sero-7.html
Next month Asus is supposed to release their generation of the memopad, which will have a 1280x800 screen, 1.2 ghz quadcore processor, front and back camera, a microsd slot, and sell for $149.