Well, since ebay and similar stuff existed I think it's not more then 20$ for each record. Even the Live Killers coloured ones are not that expensive anymore as they were back in the 90's on the record fairs. I saw some of them went for not even 50 $ on ebay. Don't loose the obi's! Without them the price is like shopping in Woolworth.
I'd estimate it at around £250-300 for the lot, which is approx $380-450 (that's assuming they're all in mint condition).
If not mint, it reduces accordingly (roughly 25% reduction if excellent and as much as 50% if VG). That's how I try and work it when buying and selling, but is by no means concrete - it's all up to you :)