Not sure what it is you are looking for. Where visas are required, there is a fixed, government charge for them. I can't see how you can get around this, short of swimming in or hiking over the mountains.

The visa is relatively expensive. Different agencies have different charges for arranging the visa - but the price differences never seem beyond the order of $10.

You'll be pleased to hear I'm about to make my first faff-free and $$-free entry as holder of a UK passport