I would recommend looking on ebay for the lowest price. I got mine for $100, although the cheapest that is ever on there is usually around $150 at least. As far as putting it together, you do have to actually assemble a lot of it and there are many pieces. I would suggest that if you do get it, do not do anything with it until you get your ground foils. You will then know how much space you have to work with and dont have to worry about moving so much around.
I don't have a microwave, but I do have a clock that occasionally cooks shit.