Rainhead Downspout Screens
Manufacturer of a simple, relatively self-cleaning Leaf Eater and Leaf Beater rainhead filters designed to filter large debris before water gets to the cistern. Can be used for above and below ground tanks. Other filters and gutter screens are also available.
Your local sheet metal shop
If you bring them a good design they can likely fabricate it for you. See here for some designs and issues to consider.
Resource Conservation Technology, Inc
Supplier of a number of well-made, relatively self-cleaning German filters meant to filter large debris before water gets to the cistern. These are primarily meant for underground installation.
High Desert Rain Catchment
This water-harvesting contractor hires a local craftsman to make lead-free steel rainhead screens for his installations.
Advantage Air Mechanical
They can fabricate galvanized steel rainhead screens, metal cistern lids and more. See here for more rainhead screen info and issues to consider.
Quick Custom Metals
They can fabricate galvanized steel rainhead screens. See here for more rainhead screen info and issues to consider.
Tony and George can fabricate galvanized steel rain head screens. See here for more rainhead screen info and issues to consider.
Southern Arizona Rain Gutters
They sell Leaf Eater and Leaf Beater rainhead filters
The Rain Store