I'm in the UK and get my film from various places, including Ag Photo, Boots, the local camera fair, ebay and of course Poundland for the incredible Agfa Vista Plus 200 135/24 for £1!!!! Poundland Film and AgfaPhoto.
If you want to see what ProImage looks like processed straight, check out Flickr for a guy called Michael Bialecki. He shoots a lot of it in Thailand and Myanmar (formerly Burma) and his photos are, IMO, fantastic. The ProImage colours are stunning - but not over-saturated or any weird colour shifts. I used to use a fair bit of Fuji Superia Reala 100 when it was around and ProImage sort of reminds me of it; not quite as neutral but low grain and great skin tones. Hope you like it.