I appreciate that you are trying to be helpful with googles, but it would have been a little more helpful to point out the original source of the calculator issue; it wasn't a set of calculators that malfunctioned, just the people tabulating the prices of the showcases were bad. And for the showcase, it appears that it wasn't the showcase; it was people on Contestants' Row. From the TV Tropes page:

and one [episode was replaced] in 2000 (due to the contestants changing places in Contestant's Row but no one noticing).

This is further backed up from our timeline's post describing the affair. From the last week of Season 28:

The original Wednesday show, taped on June 26 and redesignated at some point as episode #1513X, was never aired, apparently because two contestants ended up in the wrong spots in Contestants' Row at some point during the proceedings; it was replaced with a new episode #1513K, taped on September 11. According to our member MrBill1978, who was at the taping of episode #1513X, the two episodes had identical prizes and pricing game lineups.

Whoever ran the Wikia post probably just copied/pasted an old, incorrect version. "Fandom" pages aren't typically the most credible.

Here are my sources:
Lost Media Archive: The Price is Right (Missing 1970s-2000s Episodes)
TV Tropes: Missing Game Show Episodes
Here is the part from Lost Media Archive:
"What are missing are episodes that had mistakes take place. The third episode ever taped for the daytime revival in 1972 never aired due to a contestant being ineligible and playing anyway. The third episode of the syndicated nighttime run, also taped in 1972, was never aired due to a special set of calculators they used for the show malfunctioning. Two more episodes, taped in 1976 and 1978, were never aired for unknown reasons. On June 8, 1988, production stopped when Janice Pennington got hit with a camera, completely knocking her off the stage and broke her collarbone. As a result, she no longer wore swimsuits on the show. In 2001, yet another episode went unaired due to two contestants switching places in order to cheat. It is not known if any more episodes like this exist or what has become of these other ones. None of the ones mentioned in this paragraph have surfaced."

Pardon my language, but I call bullshit on this. Source?

He’s pulling stuff out of a hat. His other post asks if there’s even been an episode with 0/6 pricing games for one. Ergo, he’s a troll. I’ve sent a PM to Steve about this

Here are some examples:
1. The third episode of the Bob Barker era (September 6, 1972) never aired because of an ineligible contestant.
2. The third episode of the syndicated nighttime show was not aired because a set of calculators that were offered as a prize malfunctioned.
3. An episode taped in 1976 was not aired for unknown reasons.
4. A 1978 episode was unaired for unknown reasons.
5. June 8, 1988 was never aired due to Janice Pennington breaking her collarbone after getting hit with a camera.
6. A 2001 episode never aired because during the showcase, the contestants switched places to try to cheat.

The June 1988 episode DID air unless someone can say otherwise. There's video of the episode on YouTube with an edit between when the incident happened, and the reshot introduction after. They only used 2 models that day I believe, but it still went on.

And the nighttime show...malfunctioned? Not heard of this, what happened?

The video is blocked here.