Happy Thanksgiving everyone.

Is there a certain place to buy v-berth sheets/comforters? Our 36 has what seems to be a custom made mattress, and is one piece. I'd like to find some sheets to fit, and possibly a memory foam pad. (thinking of just cutting my own memory foam topper at this point)

All the sites I've found seems to have only one size sheet which seems too big.

What has everyone else done?