If memory serves right, there is no check in japan and as such they are not an accepted method of payment.
In any case, that's to be expected at any fanzine area and such, I mean imagine the costs of setting up a card payment for every single doujin artists and circles.
The comic is old enough that Ran's card is almost a year expired now
Whew, here it is.What a neat little shop.Umm, three of your latest volume, please.Thank you very much.That will be 1,200 yen!Maspark CardA parody of Master Card replaced with Marisa's Master SparkI'm sorry, but do you have small change?Small change... I have a few... Keichō era Koban!Aya☆Hata ②#762 Yukarin Goes to Comiket, Pt. 3The place where Yukari-sama said.Nwa?!Be sure to have a good amount of 1,000-yen bills and small change ready.