This holiday season is expected to be another big one for tablets, led by Apple’s new redesigned iPad Air and the upcoming refreshed iPad mini with Retina display. But high-end tablets are going to get a serious run for their money from a flurry of no-name slates that will be on sale for just $50 this holiday season. ZDNet points out several Android tablets that will be available for around $50 on Black Friday from Walmart, Toys “R” Us and other retailers. Toys “R” Us will have a 7-inch Android slate by Polaroid available for just $49.99 on Black Friday, and Walmart has an even better deal â€” a 10.1-inch Android tablet running Jelly Bean for just $49. The deals may be short-lived but they could potentially take a bite out of some first-tier vendor sales this holiday season, which could help explain the expected dip in tablet shipments this quarter.