Hello. I'm a Brazilian , therefore, a Portuguese native speaker. I can do it error free, and increase the chance of every post not to look like mere spam, then passible to be deleted by mods.
I'll bid $2,5 per thread, so we have a total of $120 per the entire project (300 forums). I consider it a fair price, and it'll just take 5 days.
Hope to her from you soon, best regads