It is possible to buy them for when compared with $5 each, so they're one within the cheapest fixes you can create.
Watch out for: Leaks and poor insulation could be an issue in the colder months of the year, with drafts and condensation causing problems like damp, mould and water damage and mold. http://gatewayhomeinspect.com/quick-fixes-for-a-leaking-shower-an-essential-home-inspection-tip/