The solution manuals for the 1st and 2nd edition are both easily found online with a quick search. As for the 3rd edition, I was able to find this [0], although I haven't verified if their answers are correct.
But it would appear that you're correct that Pearson doesn't seem interested in selling the 3rd edition solution manual to anyone that isn't an instructor [1]. IMO, fuck their antiquated gate-keeping bullshit.