this is false economy. saving money is not the objective in testing an idea. The objective is to launch the best product you can in the smallest amount of time. mvp. time trumps money - always.
It's like this. I want to fit a new bathroom in my house. I could do it, but it would take me a week, it won't cost me any money. If I hire a plumber, he'll do it in 2 days and charge $500.
Damn, $500? Well my freelance day rate is $250, so I'll just freelance for a couple of days. Net result is I just saved myself 5 days.