Here's the cheapest ram that i could find to meet your requirements.
[PCPartPicker part list](http://pcpartpicker.com/p/CWWsXL) / [Price breakdown by merchant](http://pcpartpicker.com/p/CWWsXL/by_merchant/)
Type|Item|Price
:----|:----|:----
**Memory** | [PNY 16GB (2 x 8GB) DDR3-1600 Memory](http://pcpartpicker.com/part/pny-memory-mn16384kd31600) | $97.98 @ Amazon
| *Prices include shipping, taxes, rebates, and discounts* |
| **Total** | **$97.98**
| Generated by [PCPartPicker](http://pcpartpicker.com) 2015-02-14 21:29 EST-0500 |
Here's what i'd recommend.
[PCPartPicker part list](http://pcpartpicker.com/p/fnHq3C) / [Price breakdown by merchant](http://pcpartpicker.com/p/fnHq3C/by_merchant/)
Type|Item|Price
:----|:----|:----
**Memory** | [G.Skill 16GB (2 x 8GB) DDR3-1600 Memory](http://pcpartpicker.com/part/gskill-memory-f31600c11d16gsl) | $109.99 @ Newegg
| *Prices include shipping, taxes, rebates, and discounts* |
| **Total** | **$109.99**
| Generated by [PCPartPicker](http://pcpartpicker.com) 2015-02-14 21:30 EST-0500 |
As far as reputable companies go i know of g.skill they make good ram. Pny is ok, too just g.skill is better in my opinion.