It'll not be lost on you that what works well on one rod may not necessarily match another....
With that in mind, quantity of lines to play with is the key so I'd scan eBay for second hand lines but if you must have new then one cheap option worthy of a look is item # 124003607891 but that's under 55g @78' - it'll still work though.
There's an eBay seller based in Fort William with a couple of eBay ids, one of those IDs is Nackynoo ( I think
) he often sells job lots of used lines, I'd look there too.
What you plan on using as shooting line
H