Lids that will fit on foil-lidded yogurts for lunch?

[nabigus]

Okay, I think I get the prize for most random question of the day, but:

I'm looking for plastic lids to snap on top of ds's yogurts in his lunch, to make them less likely to explode. He eats soy or coconut yogurt, so it's a standard sized container. Wildwood soy yogurt comes with individual plastic lids like this, and we've been reusing those, but the last one finally got lost, and I can't find individual-sized Wildwood near me any more.

This is the 24oz size, not the individual size, but it gives the general idea:
http://www.wildwoodfoods.com/products/dairy-alternatives/soyogurt%E2%84%A2/soyogurt%E2%84%A2/soyogurt%E2%84%A2-vanilla

Anyone seen these for sale not attached to actual yogurts?? Or any other ideas?

Thanks!

[sariana]

Can you put the yogurt in a Funtainer or other Thermos-type container?

[LMPC]

I know that the older style ikea kids cups fit well with Pringles lids. So maybe try a Pringles lid? I'm not sure if the lids would fit the new style Ikea cups, sorry.