Yup the flimsy ones.
Funny you should ask b/c a) I've been looking for them for awhile now and b) they're expensive like flushable wipes are expensive. I've found if you can get them for less than 2 cents/ea it's a "good deal" so what you're getting is actually a pretty good price (and where we will buy them next time, lol).
Our local supermarket has them for like 2 cents and even that is hard to find online though you might be able to get something with Dollar General between sales they have and coupons. They will often send a survey out after a purchase where they will give you an additional $5 off. Once I stacked 4 coupons from them and got the Dixie 8.5" plates for 2.5 cents/ea. THAT was sweet.
Oh, the last time we bought the thin plates was from Walmart but that was w/ the $10 credit they gave us for the tissue debacle, lol.