you can get tfr from most local autoparts centre but make sure they give you a discount. I also get some from a local cleaning equipment supplier although you do have to be careful with the type you buy. Backpack sprayers as available in all garden centres for about £30 although they appear on ebay for £20 but I dont know what quality!!! If your after the dogs then Hozelock sell theirs for about £70 but for the times its used it really isnt worth the extra money.