piikki
Contributor
As for GUE-F pricing, as others have mentioned, it's up to the individual instructor. Cheapest I've seen recently is $500, and the most expensive is $1500 (MX).
I've seen prices vary in that same scale, from $450 to that MX price, mostly between $500-650.
When you compare prices make sure you compare apples to apples. For example that MX course price, at least for what I remember, includes tank rentals, fills (EAN) and I think also site entry fees, if not something else too. Most in US would not. Sometimes a lower price might not include some instructor expenses that you might be expected to pay, so you are better of contacting directly if you want a precise idea.