16 Gauge Staples for Staple Gun?

I've got a Wolf Cordless Staple/Nail Gun which is an all round good bit of kit but despite my best efforts I'm really struggling to replenish my supply of staples. I can't believe it is that difficult so suppose I'm just being slow but I simply can't find anyone who sells them online in the sizes shown below.

Anyone able to help?
Thanks to everyone for the suggestions and I ended up buying the ones off ebay. They'll keep me stapling for a while!!
I always use Arrow Staples. Try their website.

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