My dogs have chewed a few of the girls footballs up, so I've been looking for some replacements for them & some cheap ones for the hounds, had a quick browse & found that Argos have a few special offers on footballs at the moment.
The Adidas Glider Football - Pink and Blue in the pic / link was £9.99, then £7.99, £5.99 & is now half price @ £4.99, has great reviews & seems to have stock in most of the 15+ postcodes I checked.
They also have Carbrini Footballs in RED
for £2.49 each, stock levels are better in some areas than others, but I managed to pick up 2 of each colour in my nearest store.
One of the other offers that they have with lots of stock around is Opti Footballs in Red, Yellow or White, £5.49 each or 2 for £7 HERE
Looking at them, I think they are very similar to the Cabrini ones, so may be a new version of them.