Outdoor Bench Cushions

I have a very pleasant terrace with outdoor setting (3 wood high back chairs and a bench high back) my aunt was getting rid of them. The only thing that I need cushions are ... but Im on a pretty tight budget and everywhere I've looked at the prices seem pretty steep. Are there places that sell all-time pads that are relatively cheap (but at the same time is not cheaply made)?

Walmart .... .... Kmart Lowes .... ..... 've eba ...