Many investment houses let you invest in their investment funds via the post. Typically, you answer an advert or ring up asking for an application form to invest in a particular fund or investment product. Some stockbrokers offer postal dealing services. While this is one of the cheapest ways to trade in shares, investors have no say over the price they buy and sell shares at. Not only is there a delay between when you decide to buy or sell and the stockbroker receiving your instructions, but the stockbroker may only trade once a day and that is the price you will trade at.