Where to find Nike tennis bandanas in London?

My mom is going to London for the next few days and she's going to have a look for them. I checked online and they are only available through the UK nike website and they're sold out. No stores in Canada or the US have them and they are hard to find on ebay.



Does anyone know what stores sell them in London?

Since Wimbledon is happeneing now hopefully I'll have some luck


Thanks and I'll give karma or whatever for any help!