Sunny,
Are you packaging it up and putting it ina closet or something? If you can leave it set up (on the stand) then a good, stretchy dust cover is a great idea. They are inexpensive and keep grimy hands of little brother's off too ! If you need to put it away after each use - there are a number of very inexpensive, lightweight cases. Yamaha makes a survival pack for that kb that has a case and a stand for about $39US. It's just a zip-up bag and a cheap, single braced "X" stand, but it'll keep the dust out !
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