I have seen gutters guards on sale in a few places. They seem to be small sections of a semi-rigid plastic mesh which clip into the gutter edging. They also seem quite expensive at $39.95 for what seemed only a small amount.
The place we are buying has rainwater as the only water supply. We can buy water from the local farmer via a borehole ( just a case of turning on a tap at the storage tank) or, if necessary, buying in a tanker full. This has only been necessary once in the last 6 years.
Accordingly we will be checking for any sign of gutter guards, which obviously will be essential to keep the leaves out.
Pam & Dave