I know this isn't quite the kind of answer you're looking for, but for those who are willing to put even more work in, $150 should be able to get you reasonably far with hobbiest electronics and a 3D printer (that price is obviously not including the cost of purchasing a printer).
Take for example, this open source chassis [1] that is based on the DJI Mavic (retail $1,000). Plenty of fun for those with the time and desire to take this even further.
Comments
I know this isn't quite the kind of answer you're looking for, but for those who are willing to put even more work in, $150 should be able to get you reasonably far with hobbiest electronics and a 3D printer (that price is obviously not including the cost of purchasing a printer).
Take for example, this open source chassis [1] that is based on the DJI Mavic (retail $1,000). Plenty of fun for those with the time and desire to take this even further.
[1] http://www.thingiverse.com/thing:2004357
I think you underestimate the price of electronics...