The title says it all I would like a window if possible.
The NZXT S340 is $51 currently and it normally is arounds $65.
Yep, Micro Center has a great sale on them this month if you happen to have one near you. Just add tax, so it's $56.99 for me.
Not sure what size you need: ATX, mATX, mITX? There are many options, but a computer case is typically up to personal preference. Try sorting the cases by price and only include the models with a side panel window. Keep in mind how many internal and external drive bays you need, too.
Here are a couple under $60 that jumped out at me:
List cases by price, and look at each one of them. Depending on what you exactly need you will find what you look for; # of fans, space, color, etc. is all determined by you.
The Apevia X-sniper2 is $50, fits an ATX mobo, has decent cooling and looks good