need cheap ssd for this setup

[pcloverakagameboss]

whats the cheapest ssd for this setup and can i even fit a ssd or another hdd also the ssd needs atleast 20gb of space

my case; Roswell galaxy 01
motherboard;asus m5a97 r2.0
hdd ; wd 640gb hard drive 7200rpm sata6
CPU;AMD fx 8320
gpu;geforce gtx 660 zontac edition
fan/heatsink;cooler master hyper 212 evo

 

[Dark Lord of Tech]

PCPartPicker part list / Price breakdown by merchant

Storage: PNY CS1311 120GB 2.5" Solid State Drive ($52.99 @ Best Buy)
Total: $52.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-05-03 16:29 EDT-0400