Most of the time I've found that dogs/pups will already come with a microchip, though I guess there will be the occasional person that wont for some reason.
Our first Husky was not the first dog we had so tbh, we didn't buy a lot before we got him. ( Attention and discipline are a much better way of showing love then buying expensive accessories in my opinion)
If you already have a dog then you may have spare items such as an old bed which will be perfectly fine to use.
Others may disagree, but I don't think you need to go overboard with treats, toys etc... (you can always buy more later on)
Old newspaper is fine in place of puppy pads though i'd be taking him/her out the backyard for that if I were you.
Moonbeam, tags are defiantly a must so a thumbs up for that
EDIT:I 'll add in that the best thing to spend your money on is quality food with human grade meat and other nutritious ingredients.