Don't they usually find polyps on the ultrasound in the diagnostics phase? Or not if it's small?

At Dominion Fertility, they recommend a mock IUI or mock IVF prior to the real one. It seems like a waste of $500 to me....anyone know if it is ABSOLUTELY necessary or how willing they are to skip it? Do all the other fertility clinics recommend a mock first?

Anyone have the current IUI costs for GWU and Shady Grove? At Dominion, I was quoted $2100 for natural IUI, $2400 for oral medicated IUI, and $3000 for injectable medicated IUI. We're most interested in oral medicated IUI but the cost just seems too high! Trying to see if there's a more cost effective option in the DC area.