Don't get mad at me but.......
You can take a case of fresh, beautiful lemons and: Zest them, place zest on sheet pan, cover with plastic and freeze, once frozen put in plastic quart containers or whatever container suitable for freezing you like.
Juice the zested lemons and freeze juice in containers suitable for freezing, whatever size you like.
(one case can be done in 2 hours)
This has saved my bottom line several times when I get a last min order for lemon butter cream, sponge, cheese cake, brulee etc....
No, you do not have to do a case at a time, but that 5# bag will go far when stored properly and at your fingertips frozen and ready to go!!!
This goes for oranges too.