If you dungioneer, and you have some coin left at the end of the dunge, go buy the lowest leather possible and make bodies, sell, repeat. You can easily make 5 to 10k xp within a couple extra minutes, provided you have 100-200k coins leftover
It's free, but I do caution you when doing this with groups, it may iritate some of the fellow party members, also it takes a while to get to lvl 70, but it's how I casually got form 63 to 73