If you want crispy, cool sheets at a reasonable price, and want to order them separately rather than in a set, see these at the Company Store.
Company Cotton(R) Percale Sheets & Bedding | The Company Store
You can buy a set or separately. We use king sheets, a percale duvet cover that doubles as a top sheet (like most hotels), and queen pillowslips. They are sooooooo crispy and cool. I love the plain white. Once I discovered these, I've stopped looking elsewhere. I really don't like soft sheets. I want cool and crisp.