balls for in those chucker things!

[nicnag]

I need suggestions for balls to go into the chucker ball thingummys, I get through about 8 tennis balls a week which is great for the pound shop but costly for me! A ball lasts one walk if it's unlucky - possibly 3 on a good week.
Does anyone have any suggestions for balls that work with the chucker whatsit or is there a brand of indesructible tennis balls out there?

 

[CAYLA]

I use a set a 3 rubber ones, they fit fab and u can chuck them further and they cannot be chewed and punctured, they come in a net and the balls are yellow, blue and green, I will have a scout and see if they are on e.bay, I get mine from whole sale, but have also seen them in wilkinsons, they are fab, I have never used the tennis balls in mine.