Well, what I do to transfer gold is: Go to lumbridge, talk to Duke and get the firebreath shield, drop it, get another drop it, until you have enough, then pick them up, bank, repeat then when you have a decent amount, trade them to your alt. You make some money too... The transfer itself is kinda slow but yeah...
This was back when they were like 1.5k ea or so, so if the price is lower, it'll be slower.
Also, its not really a money transferring method... kinda like a money making method, but ya know, works anyways :/
That's how I did it before anywho.