Welcome!
Looks like you're off to a great start there. I really like that Penna kickstarter although it does seem fairly complex. Beautiful though.
Shipping sucks everywhere. Unfortunately there isnt a lot of product being made in India yet for the mechanical keyboard community. There is however a lot in Korea and China though so I would imagine it might be a little cheaper for you? Maybe not.
As for the old IBM and Apple boards, I think a lot of ours come from places that bought a ton of them back in the 80's and 90's like schools or government surplus. At this point most of them have been sorted through and people are posting them on eBay. It is kind of rare to find them showing up in thrift stores or pawn shops anymore.