Just in CASE ?

[spacef]

yeah, recycling an old case is the cheapest option... at cooltek they have a bigger kit of sound absorber for cheap (it doesn't seem to be available in the shops i know, may be by ordering directly to cooltek) , it is designed for their own cases but with a good sharp cutter (not scissors, it is too dense for regular kitchen scissors), you can cut the foam and tar paper to the dimensions you need (careful not to cut your fingers at the same time