I use a small crumpler slingbag bought from CP at about 60 bucks, prolly can get cheaper elsewhere?
suggest you bring the cam and do a fit, doesn't have to be lowepro or crumpler as long as it does the job....
BUT you know, you're not carrying around the cam only, you will other barang barang like mini-tripod, anti skid mat, maybe some filters, spare batteries etc
you'll realistically need a bigger bag, not one that fits the cam