hello, I'm wondering if anyone knows of a place locally where I can get helium balloons inflated for a party? (I already have the balloons) Thank you for any help!

It's a bit away from FH, but Greetings on Lordship Lane in East Dulwich does helium balloons. There must be somewhere closer though.

Asda and ToysRus sell canisters (at least they did). Or if you've got a bit of time, ebay. Shops tend to be a bit sniffy about inflating balloons they haven't sold (as I've found to my cost). The florist on Brockley Rise near Le Querce does balloons so they may be able to help.