The obvious answer would be to ask Trailfinders (who are one of less than a handful of third parties I'd trust).
"Would I be able to get them cheaper by using a company like trailfinders?" - I called into Trailfinders at the weekend when I had some time to kill to price up some BA First Class tickets - the price quoted was around £100 higher than that available from BA directly and I was not impressed by their efficiency as it took them around 30 minutes to price up a straightforward Manchester - Las Vegas return compared to getting the price from the BA website in less than 3 minutes.
Jut my recent experience - hope you have better luck.
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