I done a month trip out to HQ, from Ireland so same boat as you regarding flights. Can't help you with the Portland part but the flights with united airlines cost around £600 (use skyscanner.com) and then the accommodation for the place we stayed at in downtown, which was only like a mile from HQ, cost around £2100 between the 3 of us but use (airbnb.com) so find cheaper places, your best bet would be to just rent a room out somewhere if you can't afford the higher cost of an apartment whilst you stay
Anyway hope that helps, Nathan from Portland was in 2 days whilst I was there, absolute gentleman would be cool to learn from him and the Portland 10p crew, as for HQ, I had an absolute blast whilst I was there, you won't regret the trip if you make it out, all the best buddy
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