I have booked several holidays through Trailfinders and I have always found them to be helpful. They have access to dicount holidays, flights and hotels that are not available anywhere else.
I recently used them for our holiday to Tanzania. They found cheap flights and accomodation saving us at least £200 per person. When I looked at the same package through other tour operators they were much more expensive.
In order to get the best price for your holiday you will need to phone them. In fact, I don't think you can book the holidays through the internet which is why they have dicounts available. They are always happy to answer any enquiries you may have.
If you are looking for a travel company that can offer great prices then Trailfinders beats the high street centres hands down.