It's perfectly possible, although still not really cheap since your best option is a sigma22 and I'd expect to pay ~$200+ to have a suitable one built. There are other options but I'm not sure I'd bother w/ something like twin TREADS or something like that.
I'm w/ Reks, fancy power cords seem to me to be a waste of time. If I couldn't build my own I'd still be using the same Volex already mentioned.
And I'd always go w/ a better source before upgrading anything else.