I got a price here last year on retempering in Co. Laois Ireand. The guys were looking for 100 Euro a spring. You'd buy them for that which is what I did. Might bring the old ones in for scrap and get a few pound.
Yep everything to do with vehicles is expensive in Ireland especially compared with the UK and then massively different to the US
get a new set made
and go soa 
I wouldn't go spring over unless you are not driving it on the road (crap handling), you are not going to be running huge tyres that need the clearance given with a SOA, I have a 4" spring lift and a 1" body lift and I'm running 33" tyres and can get fully articulation without rubbing