“Pumpernickel” bread can sound like “pun per nickel,” and there are jokes.
   
“And you’ll have to do better than that if you’re going to sell word-plays for 5 cents, and you’d better give a slice of black wry bread away with each one to shift em. Then you can advertise the free gift as Pun per Nickel!” was posted on the newsgroup alt.fan.goons on September 21, 2007. ” Why do I not participate in your pun slams? If I had a nickel for every pun I can slam, I’d have a pun-per-nickel” was posted on Twitter by Lemmo 📜🖌️ on April 4, 2013. “If I had a nickel for every bread pun, I’d have a pun per nickel” was posted on Twitter by Jokes of the day (and others) on September 18, 2019 (probably originally posted at PunoftheDay.com).
 
     
Wikipedia: Pumpernickel
Pumpernickel (English: /ˈpʌmpərnɪkəl/; German: [ˈpʊmpɐˌnɪkl̩]) is a typically dense, slightly sweet rye bread traditionally made with sourdough starter and coarsely ground rye. It is sometimes made with a combination of rye flour and whole rye grains (“rye berries”).
       
Google Groups: alt.fan.goons
nemo
Sep 21, 2007, 12:38:43 PM
(...)
And you’ll have to do better than that if you’re going to sell word-plays for 5 cents, and you’d better give a slice of black wry bread away with each one to shift em. Then you can advertise the free gift as Pun per Nickel!
   
Twitter
Lemmo 📜🖌️
@Lemmo
@punsultant @loftliterary Why do I not participate in your pun slams? If I had a nickel for every pun I can slam, I’d have a pun-per-nickel.
11:14 AM · Apr 4, 2013
   
Twitter
Ben Gross
@bhgross144
Bad puns a just a penny. Good ones cost 5 times more. You know…a pun per nickel!
12:27 AM · Oct 4, 2016
   
Twitter
THIS is Michael M.
@EsotericOaf
I’d consider my new joke bakery a success if it could sell just one pun per nickel.
9:27 PM · Aug 2, 2017
   
Twitter
cephaccino!
@cephaccino
If I had a nickel for every bad pun I know, I’d have a pun-per-nickel.
2:14 PM · Feb 5, 2019
   
Twitter
Phillip Borgenicht
@philborgenicht
Someone makes a play on words about bread and you give them 5 cents, it’s a pun-per-nickel
1:24 PM · Mar 10, 2019
   
Twitter
Jokes of the day
@jokesofthedaydn
‘If I had a nickel for every bread pun, I’d have a pun per nickel.’
4:28 AM · Sep 18, 2019
   
Twitter
Daily Humour
@humourstic
If I had a nickel for every bread pun, I’d have a pun per nickel. Comment On This Pun!
4:54 AM · Sep 18, 2019
   
Twitter
Just another Jokes
@factjokes
If I had a nickel for every bread pun, I’d have a pun per nickel. Comment On This Pun!
10:43 AM · Sep 18, 2019
   
Twitter
Murphy Slaugh: Gallifreyan Time Dragon/Pun Master
@MurphySlaugh
(Meta-)Pun of the Day: If I had a nickel for every bread pun, I’d have a pun per nickel.
8:14 AM · Oct 1, 2019
   
Twitter
bright horse
@brighthorse
If I had a nickel for every bread pun, I’d have a pun per nickel.
1:45 PM · May 4, 2020
 
Reddit—Jokes
Posted by u/doinkypoink May 23, 2020
Honestly, if I had to offer you lot money for every bread joke..
Y’all would have a pun per nickel.
     
Twitter
Alice Mills
@millsalice144
If I had a nickel for every pun I’ve posted, I’d have a pun per nickel.
3:28 AM · Jul 27, 2020
   
Twitter
Doc 
@DocAtCDI
If I had a nickel for every bread pun I’ve ever heard,
I’d have a “pun per nickel”
8:26 AM · Sep 21, 2020
 
Reddit—Puns
Posted by u/spinnaker190 October 9, 2020
Bread
If I had a nickel for every bread pun, I’d have a pun per nickel. 😂🤣😂🤣
       
Twitter
S.A.
@Scottaus10
If I had a nickel for every bread pun, I’d have a pun per nickel
3:29 AM · May 23, 2021
 
Reddit—Shaneisms
Posted by u/weewoozesty June 4, 2021
Shane, you can not sell bread jokes at the bakery for a pun per nickel. - Management
   
Twitter
Dzintra - Author
@DzintraSullivan
If I had a nickel for every bread pun, I’d have a pun per nickel.
#notsorry
7:58 AM · Feb 15, 2022
 
Reddit—Dadjokes
Posted by u/Veto111 May 23, 2023
I’m trying to make some extra dough by selling jokes for 5 cents each.
It’s a pun per nickel.