If you're not planning on spending much, consider buying these Chinos. It's a popular product for a good price. Another smart option is these Dockers Casual Trousers. It's a product you're bound to love which also doesn't cost the earth. You may also want to look at these Casual Pants. This item is not expensive either, but it will make a difference in your wardrobe.
If you can afford to spend a little more, look no further than these Jag Jeans Chinos. This item doesn't cost too much, but absolutely deserves a spot in your wardrobe.