Celery is a great vegetable that is tasty and crunchy so it seems like it could go down well with guinea pigs.
Celery is just fine for guinea pigs to eat but there are certain considerations and things you might want to take note of before you feed it to your guinea pig.
It can be purchased from any supermarket that you have close to you. There are no special types that you need to buy. Any of the varieties will do.

image: Wikipdeia

10 considerations to make when you feed your guinea pig celery

Can a guinea pig eat celery?
Celery can be a great treat for your guinea pig if it is fed in moderation so do go ahead and feed it to your cavy. Its great chopped up and mixed with other vegetables as well to give your guinea pig some variety.