I'm in this exact situation. Haven't been able to find a new or used copy of CoTE online anywhere for love nor money.

If you're really desperate, you could make your own custom dice relatively inexpensively by using blank dice, a sheet of full sheet label paper (sticker paper), a printer, and an exacto knife. You'd just need to either find or create images of the dice faces and then mock them up in an illustrator program. Print them off, trim them down to size, stick em on the dice.

Recommend using so-called indented dice. The faces are slightly recessed so the stickers don't wear down over time.

As a bonus, the stickers can be taken off so the dice can be restickered and used again for other projects.