Millerain Original Waxed Cotton Dressing in US (or alternate)?

[SidewinderX]

Hey -- I've got a Lands End waxed cotton jacket that's ready for a re-wax. The jacket is labeled as being made from Millerain original fabric, so my instinct is to get the Millerain dressing to try and re-wax it. However, I can't seem to find it for sale in the US (amazon wants $50 for it, UK online stores sell it for 5GBP!).

So, looking for advice -- can I just use any old other re-waxing wax like Filson, Otterwax, or Barbour dressing?

Thanks!