Classic problem. You need only one or very few of said item: Only being sold in bulks of 50/100/200/etc. And logically nearby physical stores in your hometown don't sell any either.
I love catching the translation from Moonspeaker live. And Mizuki hasn't seen this problem for a while... but he did overbuy parts before now during another electronic arc.
He could take 10 for himself and pack the rest in 4 lots of 10 and put them on ebay. There are propably lots of people with the same car and the same problem who would buy them.