best low priced bookshelf speakers


My son-in-law is looking for a set of under $200 bookshelf speakers for his outlaw audio r2250 receiver. Any suggestions?  I have an old NHT sub zero subwoofer for him but no speakers.
jjjaker
All good advice.  I was looking at used speakers up to $300 and many were there.  There is a pair of NHT classic 2's at $141 but as was said they might not be the most fulfilling.  They originally retailed at $600 although price isn't the best indicator of sound and I have not listened to them.
Under $200 that's a tough one. 
The Outlaw 2150 is highly regarded for the price.
I would try and stretch the budget if at all possible to $600.

Although maybe something like this -

https://www.musicdirect.com/speakers/Wharfedale-Diamond-225-Bookshelf-Speakers-Black-DEMO