Hi John H,
You can still buy "Eclipse" branded Junior blades in a number of 'tooth' sizes and they are not expensive.
I purchased my last 3-4 packets on the Isle of Wight (in Hursts – an excellent hardware store) but I'm sure you can find a good local tool shop that will stock them. And of course there is always the internet but I try to use my local HW guy when possible – mine will get stuff in for me if asked to…. (Use them or Lose them)
I've still got supplies of other hacksaw "Brands" I've purchased over the years and they are pretty rubbish by comparison. I will give a special mention to some purchased from Robert Dyas (their own brand) which are complete c**p.
I now use these for any real butchery/garden jobs where I'm probably going to throw the blade away afterwards anyway – or if one of my sons wants to borrow one. There's no point in wasting a good one on them as (based on previous experience) it's going to get either broken or lost.
I will admit to being "fiscally restrained" with some of my tool purchases but I learnt long ago that good hacksaw blades are well worth the extra money (same is true of files). And "Yes" – I have a number of hacksaws with different sized blades (tooth numbers) in them and I do keep a Junior one just for brass….
Regards,
IanT