$6/L isn't bad. Couldn't you find an AMSOIL dealer in the area? Most places seem to have one, commercial or private, and I know I've seen 0w20 from them. $35.85/Gal direct from them. Sure it's closer to $9/L, but I know I've run their 0w30 for 6000 miles with only a filter change at 3000miles (plus a top up) and the oil was still good.
I'm biased though, having grown up using AMSOIL in everything from snowblower to motorhome.
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