Absolutely, there are many caskets on Amazon and they'll overnight them to you. Costco has them, too.

My sister picked hers out and had it in her information which specific red casket she wanted. It made it easy for her daughter.

You can find inexpensive urns, too, but honestly, I think you could easily find a suitable container without it being an actual urn.

It would be most appropriate for me to be popped into a piece of Tupperware and left on the kitchen counter forever.