I would think the only place that you'll find that COULD do that would be a plant that manufacturers foam mattresses! It requires a special band saw that would be hard to find I'm afraid! And when you find one, they would be reluctant to do it because they want to sell you a new one!
You could check with the local cabinet shops to see if they have a band saw that could handle it!
Good luck, happy trails, and God bless!
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Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD