Where is the best place that I can buy some outboard 2 stroke oil from. Would prefer to buy in bulk like a box of 10liters + or so.

Kings Marine wrote: Sierra reduced smoke, ashless two stroke oil is the go. Whatever you do dont buy cheap two stroke oil, I have just had yet another engine fail with collapsed bearings using cheap oil.

Well $92 per 1gal is expensive and $38 per 1gal is cheap
somewhere in the middle would be a good idea, I sell Sierra oil for $49.99 1gal
OEM oil is generally from $55 - $92 1gal retail, depending on what oil you need (e.g. ETec need the $92 oil, HPDI need the $79 oil)
A conventional two stroke would use oil in the $40 - $60 1gal bracket

I am in East Auckland thanks

I sell Sierra and can ship to anywhere in NZ, I'm sure KM does the same

a good 2 stroke oil be synthetic 2 stroke oil it prevents carbon build up in the ring grooves eliminating stuck rings & compression loss 

without going into all of the tech issues of the two stroke oil. TCW 3 standard is the required spec for oil injected two stroke engines, some manufactures have a higher standard for their oil but there is no higher spec for two stroke oil, so it is still labeled as TCW 3, but in some cases it will perform better in a two stroke engine than others. Like car oil you can buy 20W-50 at Repco and you can buy 20W-50 from say Castrol - both oils are the same rating and both oils will go in your car, but both oils are not the same !!!!!!
What is even more confusing is that some synthetic two stroke oils do not meet the standard for TCW 3 oil
for example  Optimax DFI oil is not recommended in a normal oil injected two stroke engine
I notice BRP XD100 is also not labelled as being TCW 3

Sorry Durban
clearly printed on Optimax DFI synthetic oil bottle
" it is not intended for use in any engines specifying a TC-W3 oil"

In fact when you use a Mercury Optimax high performance engine you must use the standard TCW3 oil and not the correct synthetic Optimax oil because of lubrication issues. Yes I agree synthetic oils tend to burn cleaner than a mineral oil, but not at the expense of lubrication.
I personally have seen engines destroyed using synthetic oil, and when your talking a 30k engine it can be an expensive mistake.

kingsmarine can you use yamalube on mercury 2 strokes?

i'm going to give this a try soon in my 2006 50hp merc elpto. less smoke would be great when drift fishing.