I do of course often pop in there, as they are about 5 minutes walk from my house.
But, they don't appear to stock this particular line.
GAK also sometimes do this irritating thing where the shop doesn't have something in stock, only the web-sales bit have it (and sometimes the web prices are cheaper).
However if I order from the web sales, they'll send it by a courier who will try to deliver it when I'm out at work, meaning I can never actually receive the goods and will thus have to go to collect them in person from the courier's depot in the depths of west sussex. I don't have a car and there's no bus goes there.
I thus always get embroiled in these daft sap-the-will-to-live arguments with the shop staff (or the web sales staff on the phone), on a saturday, when I say "but can't we just go to the web stock room next door and you can give me the item and then we don't have to pay for a courier to not be able to deliver it to me? I could just take it now!" and they go "No, nobody's allowed to visit the web sales depot!" and I'm "but it's just round the corner! I don't want to burgle it, I just want to buy something!" and they're "well you can't" and I'm "well, why can't *you* go there, get the item, bring it here to the retail shop, and sell it to me?" and they're "oh no we can't possibly do that, the web-sales lot is an entirely seperate company, we've no connection to them at all!" and I always go "what, apart from having the same name?" and after this happening about 5 times now, I'm a bit bored of it...