To see what would happen, Brian Klug tried to buy a CD-ROM on Amazon of an instructional science program mispriced at $2,875,934,133.57 (plus shipping). What happened is that he bought it. Sounds like something similar as to what happened with those $23 quadrillion Visa errors where binary zeroes became hexadecimal spaces instead.
I bought that 3 trillion dollar Amazon item. Will post updates! [Reddit] (Thanks to GitEmSteveDave!)