Well I can maybe offer some advice here.
The mounts you were quoted were mostly likely the common a4 b7 mounts part numbers :
Which will be around £225, trade price for them is about £180. So not much of a mark up.
Euro car parts might stock them but they are not listed on there websites well for me atleast. The lemforder as stated above are generally the audi part with grinded off numbers and labels as I have seen this first hand with the suspension arms etc.
Now in my case im planning on keeping my car for longer period of time so im going for the RS4 engine mounts which is a direct fit.
They will last longer than OE mounts and will make it slightly stiffer. As you would imagine the RS4 engine is a lot heavier than the 2.0t lump. If this is something you are interested in the part number is as follows:
08D0199379AD - £92 trade, £114 retail
So if you did decide to go for purchasing from the stealer. I would highly suggest to get the RS4 mounts. The above part number works for both sides of the vehicle.
Otherwise to keep the ride the way it is try stay clear of solid mounts as they are not as pleasant and change the ride to which you will be used to.
Hope this helps