I did initially consider just buying a replacement transmission but it wouldn't be economically feasible.

$1600 + shipping + duty + taxes + ~$2000 --> converted to CAD @ 1.38 = $2760
Labour to install (because I'm completely incapable of doing it myself)... let's say 8 hours mechanic time? - $600

Perhaps my calculations are a bit off but for >$3000 CAD I don't think it's worth it for an oil leak on a car worth about what I just paid for the tranny.

On the other hand my mechanic is willing to do the entire thing, parts and labour for about $2000 and I suspect less if I give him some of the big ticket items. Being a Canadian citizen probably doesn't help, as I suspect it'd be cheaper if I did this in the US but hey, what can I do about that.