There aren’t a lot of modern Pikachu cards below 10 USD anymore (although I do have some of the SWSH061 Pikachu V incoming in German/French/Italian for ~7 euros each), but here is the next best thing: transparent ziplock backs and plastic paper sheets, rofl 
Bought them on impulse when I was looking for the Kura Sushi miniature keychain from the same promotion (which was a bit more popular/expensive):
Combined they’re just below 10 USD (excluding additional middleman fees and shipping from Buyee to my place of course), but I’ll combine it with some other items anyway.
Greetz,
Quuador