NotTooOld, I think the cost of lessons varies but not by much; I restarted my piano lessons in October 2009 after years of not having had
a piano, and was paying £10.00 for a half hour lesson. When I gave up in 2014, because we had moved and I went from a ten minute walk to a half hour drive to get to him, I was paying £13.00 for half an hour. Half an hour doesn't sound a lot, but it really is enough. I was about to move on to Grade 5 so I did think I'd achieved something when I stopped my lessons, but I felt I had plateaud and am not sure I ever would have been any better than that. As for keyboards, you need to find out if the teacher you choose teaches keyboard - some do both and some don't.