You are right robotics is expensive, though, you can always start everything from somewhere, you could for instance learn from the very beginnings by making simple programs in BASIC, it should be enough to at least make you decide if you even have the mindset of being a programmer, which is required if you want to get into robotics. As for puzzles, it depends if you mean a jigsaw puzzle or any kind of puzzle. Try making some sketches of a box and try to think of ways of how you would lock said box, and come up with unique ways of unlocking each lock. Games like Myst might also help jog the creative mind in that direction.
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