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Get a laptop desk with adjustable arms. You'll find the extra attached mousepad flimsy, so put your mousepad on top of a book beside you... it's more comfortable this way anyway
This desktop computer stand $20
Cash, pick up near Springfield & Broad.
There is one that looks almost like that being sold for 36 bucks on Amazon I doubt printing will be that cheap.
How about something like this with a separate tray for the mouse to make up for a narrower shelf?
I use two of these. Even the little side shelf is nice for an effects pedal.