A company called LePan makes a 10" Android tablet that fits in most Ipad cases and sells for $199..
Don't get one! I've gone through 3 of them in 9 months.. They have a crappy power port design that ends up breaking so it won't charge
I've had 2 fail this way.. spent a month waiting for a replacement after the first one broke.. 1st replacement arrived with a defective SD slot.. They took another 4 weeks to get a 2nd replacement out.. That fucker broke...