Motor Mounts OEM v Everything else
 

Need to replace my motor mounts

Mechanic wants about 100 bucks a piece for OEM replacement motor mount which is a pretty decent price. ECS has them for about 120 per.

Get OEM replacements or the CRP aftermarket ones...

Audi B5 A4 Quattro 1.8T > Engine > Mounts > ES#1899520 Engine Mount - Left Side - 8D0199379AQ

would i feel the difference? Is it worth it to save the 120 bucks?

Who knows how long the really cheap OEM replacements are going to last. If you want to go stock mounts then OEM might be the best choice, if you want to do a slight upgrade then you can go OEM 2.8/2.7 mounts which are still fluid filled. If you have an upgrade turbo then you would want to upgrade to a non fluid filled motor mount like the RS4, Stern or Density mounts.