When I used mt gox, there was PayPal-like service called Dwolla that would do the ach transfer and you could transfer to Mt Gox.

It seemed like a shady or ill-advised business, and they shutdown the consumer part of it at some point.

I think they might have had some Japan bank support and some other sketchy things that kept moving around a lot as accounts were getting opened and shut down left and right for them.

I never bought any Bitcoin on Mt. Gox, sadly and later, thankfully.

You had to use a PayPalesq 3rd party service but you could do ACH transactions through that